6 Best Plastic Shims For Leveling Hose Supports For Rvs

Nothing ruins a tranquil campsite faster than the slow, agonizing realization that the RV sewer hose is backed up due to a sagging midsection. Ensuring proper drainage is not just a chore for the meticulous camper; it is a fundamental requirement for maintaining a sanitary and hassle-free living environment. Selecting the right shims and leveling gear transforms a potential plumbing disaster into a seamless, gravity-assisted experience.

Disclosure: This site earns commissions from listed merchants at no cost to you. Thank you!

Tri-Lynx Levelers: The Classic Interlocking Block

Tri-Lynx levelers set the industry standard for modular versatility, serving as the go-to choice for those who value a proven system. Their signature interlocking design allows for stable, skyscraper-like stacking, which provides a solid base for both vehicle tires and hose support cradles. Because these blocks are lightweight and highly resistant to environmental degradation, they remain a reliable staple in storage bays across the country.

The primary advantage here is the sheer predictability of the system. Whether the ground is soft sand or loose gravel, the wide surface area of the blocks prevents them from sinking, which keeps hose support equipment perfectly aligned. This is the ideal solution for campers who want a one-and-done purchase that functions consistently across diverse terrain.

If the goal is a straightforward, no-nonsense setup that rarely fails, Tri-Lynx blocks are the definitive answer. While they take up more storage volume than folding supports, their durability and load-bearing capacity make them an indispensable asset for heavy-duty rigs. Any camper prioritizing structural stability over compact storage will find these to be a cornerstone of their setup.

Camco FasTen Blocks: Best for Heavy-Duty Support

When the terrain is uneven and the hose setup requires significant elevation, Camco FasTen blocks offer the ruggedness needed for heavy-duty applications. These blocks are engineered with a higher weight threshold and a more aggressive interlocking pattern than most standard alternatives. They are particularly effective in long-term site setups where ground movement might otherwise compromise the drainage slope.

These blocks thrive in conditions where other plastics might crack or slip under load. Because they lock together so tightly, they function as a single, unified foundation rather than a precarious tower of individual pieces. They are the preferred choice for those who park on unpaved, uneven sites and require a rock-solid, vibration-resistant base for their gravity-fed systems.

While they may feel slightly bulkier to manage, the trade-off for that rigidity is peace of mind. Choose FasTen blocks if the RV sits on terrain that shifts or if the hose support requires a tall, secure elevation to maintain proper pitch. They provide the most secure platform available for those who refuse to compromise on drainage integrity.

Andersen Camper Leveler: Easiest Fine-Tuning

The Andersen Camper Leveler moves away from the “block stacking” paradigm, utilizing a curved wedge system that allows for infinite fine-tuning. While typically used for tire leveling, these wedges are exceptional for hose support when precise, incremental slope adjustments are needed. They are remarkably simple to operate; simply slide the wedge under the support until the desired height is achieved.

This system shines in scenarios where speed and ease of use are the primary objectives. It eliminates the frustration of trying to balance supports on unstable block piles, instead offering a smooth, sliding mechanism that stays put once set. For the camper who moves frequently between sites, the efficiency of this system is unmatched.

For those who prioritize micro-adjustments and quick setups, the Andersen Leveler is the superior choice. While it lacks the extreme vertical height of a stacked block system, its precision and user-friendly operation make it a joy to use on slightly uneven ground. It is an excellent investment for travelers who prefer streamlined gear over complex assemblies.

Valterra Stackers: A Budget-Friendly Stacking Set

Valterra Stackers provide a highly accessible, entry-point solution for campers who want to maintain proper hose pitch without a large capital investment. These stacking units are lightweight, easy to clean, and designed to nest within one another for compact storage. They serve as a perfect bridge for those transitioning from improvised DIY supports to dedicated, manufactured equipment.

What sets these apart is their portability; they occupy very little space in the RV basement. While they may not withstand the massive weight of a heavy motorhome tire, they are more than robust enough to handle the relatively light load of a flexible sewer hose. They offer exactly what is required to keep a hose off the ground and sloped correctly at a fraction of the cost of premium systems.

Valterra Stackers are the logical selection for the weekend camper or the budget-conscious traveler. They get the job done efficiently without adding unnecessary weight to the rig. For those who want reliable functionality without spending heavily, this is a clear-cut choice.

Wobble Wedges: The Ultimate Shim for Small Gaps

Sometimes, a full-sized leveling block is simply too much, and this is where Wobble Wedges become the “secret weapon” of the seasoned camper. These small, tapered shims are designed for micro-leveling tasks where precision is paramount. If a hose support cradle is slightly off-kilter or rocking on a single stone, a Wobble Wedge provides the perfect, non-slip fix.

The genius of this product lies in its simplicity and size. They can be tucked into small gaps beneath hose stands or cradles, ensuring that every section of the support structure is perfectly flush. Their material composition provides just enough grip to prevent sliding, even on smooth concrete pads.

These are an essential addition to any camper’s toolkit, regardless of what primary leveling system is used. Keep a pack on hand for those inevitable moments when a base support refuses to sit flat. They are not a primary solution, but they are the ultimate problem-solver for fine-tuning stability.

Hopkins Graduated Level: For Precise Adjustments

For those who approach RV setup with a scientific mindset, the Hopkins Graduated Level provides a clear visual indicator of exactly how much lift is required. This is not a shim in the traditional sense, but it is an essential diagnostic tool for determining exactly which shims or blocks to use. It takes the guesswork out of the leveling process by showing, in precise increments, where the slope needs to be corrected.

Using a graduated level turns an otherwise tedious trial-and-error process into a quick, calculated adjustment. When placed near the sewer outlet, it provides an immediate reading of the drain angle, ensuring that the hose maintains the necessary gravity-fed pitch. This prevents the common error of over- or under-compensating with leveling blocks.

If you value precision and want to ensure that your gray and black water tanks drain completely, this tool is indispensable. It pairs perfectly with any of the stacking blocks mentioned above, giving the necessary data to achieve a perfect setup. It is the logical choice for the camper who demands accuracy in every aspect of their camp setup.

Why a Level Sewer Hose Is a Non-Negotiable

A sewer hose that lacks a consistent, downward slope is a recipe for internal debris accumulation. When a hose sags, liquids may drain, but solid waste remains trapped at the lowest point, leading to blockages and foul odors. Proper leveling ensures that the entire system clears completely, which is vital for sanitary tank maintenance and preventing expensive plumbing issues.

Beyond the plumbing health, a properly supported hose is shielded from ground debris and physical damage. Dragging a hose across sharp gravel or asphalt can create pinhole leaks, which are notoriously difficult to repair. By elevating the hose on leveled supports, you keep the material protected and extend the overall lifespan of your sanitation equipment.

Consistent drainage also contributes to a more pleasant environment around the campsite. Pooling wastewater is a health hazard and an attractant for pests. A gravity-fed, supported hose eliminates these risks entirely, turning a necessary maintenance task into a simple, automated part of the setup routine.

Blocks vs. Ramps: Which Leveling Style Is For You?

Choosing between blocks and ramps often comes down to the frequency of movement and the type of terrain encountered. Interlocking blocks are generally superior for long-term sites or locations with extremely uneven, soft, or shifting ground because they offer a wider, more stable footprint. They can be configured in almost any height or shape, making them the ultimate tool for complex leveling requirements.

Ramps, conversely, offer a “drive-on” approach that is unbeatable for quick overnight stops. They provide a smooth, gradual transition that is far faster than building a tower of blocks piece by piece. However, ramps lack the vertical flexibility of blocks and can sometimes slide on slick surfaces if the rig is moved improperly.

Assess your typical camping profile before investing. If you frequent established parks with relatively level concrete pads, a simple set of ramps or a smaller block kit will suffice. If you find yourself in primitive or remote locations with significant ground pitch, the modularity of interlocking blocks becomes an absolute necessity for success.

Pro Tips for a Perfect, Gravity-Fed Hose Slope

To achieve a perfect slope, always start at the RV connection and work toward the sewer inlet with a consistent, downward angle. The most common mistake is creating a “valley” in the middle of the hose, which inevitably leads to standing water and blockages. Use the hose support cradles to create a gentle, continuous decline that mimics the slope of the plumbing within the rig itself.

Always check the hose slope after you have finished setting up the interior of the RV. The act of settling, leveling the trailer, or even just people walking inside can slightly shift the hose supports. A final walk-around to ensure that the hose is still resting firmly in its cradles is the difference between a clean drain and a mid-trip headache.

Consider using specialized hose bridges or reinforced supports for long runs, as flexible hoses tend to sag even with high-quality supports. Secure the hose to the cradles with light bungee cords if there is significant wind, as a shifting hose can quickly lose its optimal pitch. Consistent attention to these details ensures a system that functions flawlessly, every time.

Beyond Shims: Other Hose Support Essentials

While shims and blocks are the foundation, the actual hose support cradles are equally critical for a complete system. Look for lightweight, folding accordion-style supports that can span the entire distance between the RV and the sewer inlet. These act as the primary guide for the hose and make the addition of shims much more effective.

Do not overlook the utility of a 90-degree adapter or an elbow at the sewer connection. This allows the hose to sit naturally without bending sharply, which reduces stress on the hose material and helps maintain the required slope. A threaded sewer connector is also essential for a secure, airtight seal that prevents leaks.

Finally, keep a dedicated cleaning brush and a supply of biodegradable sanitation treatment in your storage bay. Even with a perfect slope, occasional maintenance is necessary to keep the system running efficiently. When the foundation—the shims and supports—is solid, these secondary tools ensure that the entire plumbing process remains clean and hygienic.

Selecting the right combination of leveling shims and supports is an investment in the long-term functionality of your RV. By focusing on stability, ease of adjustment, and the specific requirements of your favorite camping terrain, you can ensure that your setup is always ready for the next adventure. Equip your rig with the right gear, keep your slopes consistent, and spend less time worrying about plumbing and more time enjoying the great outdoors.