What is the Best Material to Cover a Trailer With?

I. Choosing the Best Protective Cover for Your Trailer: A Comprehensive Covering Guide

Your trailer, whether a practical tool for transporting goods or a camping partner carrying your dreams, is a important investment. Exposing it to wind, sun, rain, snow, and frost will undoubtedly accelerate its aging, leading to rust, component damage, and fading. Therefore, choosing the right “best protective cover” is very necessary. But with a dazzling array of options on the market, what material is the best? How can you choose the right size? And how durable can you expect it to last? This article will answer all your questions.

When choosing trailer cover materials, it’s essential to consider weather resistance, water resistance, abrasion resistance, weight, and aesthetics.Of course ,price can not be ignored either. Several common materials each have their pros & cons :

PVC (Polyvinyl Chloride) Coated Polyester Fabric:

The most common trailer tarpaulin material.

What makes it stand-out: Moderate cost, good water resistance, tear resistance, heat-welded seams, muti color and thickness options, and good stain resistance. Commonly used for cargo box covers, box trailers, and fixed canopies. At the same time: It gradually ages (cracking, powdering) under prolonged exposure to strong UV radiation and high temperatures, but modern formulations with added UV stabilizers and anti-aging agents significantly extend its lifespan. Common specifications range from approximately 500D / 500–900 g/m² to the heavier 1000D / 900–1200 g/m², also expressed in thickness as 0.45–1.2 mm.

Thermoplastic Polyurethane (TPU) film:

Softer, cold-resistant, abrasion-resistant, and environmentally friendly (chlorine-free) than PVC. It offers good breath ability and tensile strength, and its UV-resistant formulations are becoming increasingly sophisticated. Generally more expensive than PVC, considering the cost ,it’s suitable for high-performance camping tents or scenarios requiring better folding flexibility.

Polyethylene (PE) woven fabric:

Lightweight and inexpensive, commonly used for disposable or short-term protective coverings. Not resistant to prolonged sun exposure and abrasion; water can easily seep in at the seams; not recommended for long-term outdoor use. A good option for temporary cover with tight budgets.

Canvas (coated cotton canvas/acrylic-treated canvas):

A traditional natural material with good breath ability and resistance to “baking” goods at high temperatures (advantageous for some goods). However, it becomes heavier after absorbing water, dries slowly, and its waterproof and mildew-resistant capabilities highly depend on post-treatment. High-quality waterproof canvas can be considered for long-term camping use, but requires more maintenance.

All in all : If you need to cover a box trailer or use it outdoors long term and require waterproofing and abrasion resistance, PVC-coated polyester fabric(PVC tarpaulin) is the most economical and practical choice. If your budget allows and you want a longer lifespan and a better experience, consider TPU. For short-term protection or light loads, PE will be a good option.

II. What Size Tarp to Cover a Trailer?

Choosing the right size is very important . It won’t cover the car if it’s too small, and it will be easily blown away by the wind if it’s too large, damaging the paint. Please follow these steps:

To calculate tarp size, you must measure the trailer’s length (L), width (W), and height (H) from the top edge of the trailer to the ground or the top of the load you want to cover.

General Formula for a Rectangular Box Trailer

Tarp Length = L + 2H + overlap

Tarp Width = W + 2H + overlap

Usually, an overlap of 10–30 cm on each edge is recommended to allow for proper anchoring.

Example Calculation

If your trailer measurements are:

Length: 3.0 m

Width: 1.6 m

Height: 0.8 m

Overlap: 0.2 m

Then the final tarp dimensions should be:

Length = 3.0 + 2(0.8) + 0.2 = 4.8 m

Width = 1.6 + 2(0.8) + 0.2 = 3.4 m

Other Factors to Consider

Curved roofs: Use the curved arc length instead of flat height when calculating.

Tie-down points: Spacing of 40–80 cm is typical for grommets or hooks.Ensure there is enough excess material to create tie-down points, use ropes, or bungee cords. It’s safer and more secure to bundle up excess material than to have a cover that is stretched taut.

Reinforced edges: Always choose covers with welded seams, reinforced corners, and heavy-duty edging.

And always remember that It’s always better to have a cover that is slightly too big than one that is too small.

III. Are PVC box Trailer Covers Waterproof?

One word : Normally waterproof, but the key lies in the construction and details.

The Material itself : The PVC coating is a continuous, impermeable membrane, theoretically capable of complete waterproofing. High-quality PVC tarpaulins typically show a high level of impermeability (water pressure resistance) in material testing.

Seam construction : The decisive factor is the seam method. Hot air welding /high-frequency welding/branded seams can achieve near-integral waterproofing; while sewn seams, if not sealed, will allow water to seep through the needle holes. Sewn seams are often reinforced with sealing strips, duct tape, or external waterproof strips to enhance waterproofing.

Openings (door seams, zippers, vents) : These areas can easily become water ingress points if poorly designed and constructed. Professional trailer tarpaulins are designed with flip-up water barriers, covered zippers, or waterproof panels.

Abrasion and aging : Long-term UV exposure, mechanical friction, and chemicals (such as gasoline and solvents) can damage the coating, leading to micro-cracks and water seepage.

Considering above statement,we suggest : When purchasing, remember to check whether the manufacturer can perform hot air welding joints, whether they provide waterproof rating information, and request special waterproofing treatment for common weak points .

IV. How Long do PVC Camper Trailer Covers Typically Last?

How long do PVC camper trailer covers typically last ? Actually , it’s affected by a variety of factors: material formulation (whether it contains UV stabilizers), thickness, frequency of use, whether it is frequently exposed to strong sunlight/salty winds at the seaside, mechanical wear, cleaning and maintenance methods, etc.

In general:

Low-grade PE or thin PVC: 1–3 years(under strong sunlight or frequent friction)
Mid-grade PVC (600–900 g/m²): 3–7 years
High-grade PVC or TPU with UV additives: 7–10+ years(with good maintenance)

Factors that affect lifespan of PVC camper trailer.

Ultraviolet (UV) radiation: UV radiation is a major cause of material aging. Choosing products containing UV stabilizerand antioxidants can extend their lifespan.
Environment: High temperatures, strong winds, salt spray at the beach, acid rain, or industrial pollution all accelerate aging.
Mechanical friction and sharp objects: Scratches during loading and unloading can cause localized wear.
Maintenance: Regular cleaning (to remove salt and dirt), applying a special protective coating, and avoiding prolonged contact with petroleum solvents can extend lifespan.
Storage: When not in use for extended periods, fold and store in a dry, cool place, avoiding moisture, mold, or long-term pressure marks.

Small Tip to Extend Lifespan: Every year or two, treat your cover with a specialized fabric protectant spray designed for PVC or canvas. It rejuvenates the water-repellent layer and adds extra UV protection.

V. What Color of PVC Caravan Hitch Cover Lasts Longest in the sun?

The effect of color on weather resistance is not simply a matter of “lighter colors are better/darker colors are worse.” The secret lies in the chemical stability of the pigments and dyes and the presence of UV inhibitors. Color longevity is influenced by heat absorption, pigment quality, and UV resistance. Some colors fade faster, while others hold up better.

Light colors (white, beige, light gray) are generally more heat-resistant: Light colors reflect more solar energy, resulting in less temperature rise, lower thermal expansion and contraction, and lower material thermal stress, which helps slow down degradationand aging. Therefore, under strong sunlight, light colors often exhibit slower visible fading and physical aging.
Dark colors (black, dark blue, dark green) absorb more heat: This leads to higher localized temperatures, and prolonged high temperatures accelerate the decomposition and powdering of plastics. However, black pigments (carbon black) themselves have good absorption and stabilizing effects on ultraviolet rays. In some cases, black can even provide some UV protection through the pigment itself (for example, carbon black is commonly used as a UV stabilizer in plastics). Nevertheless, the heat absorption of dark colors still accelerates the thermal oxidation process.
Color alone is not enough .The most crucial factors are pigments and additives: High-quality outdoor-grade pigments (lightfast pigments) and matching UV stabilizers (such as HALS, UV blockers) can significantly improve color and material lifespan. Some light colors will also fade quickly if low-quality dyes are used.

Practical Buying Checklist

To ensure you choose the best trailer cover, keep the following points in mind:

Makeright option on fabric : PVC 600–1000 g/m² is ideal for long-term trailer use. TPU is a premium choice.
Check the seam construction: Welded seams are essential for waterproofing.
Ask for UV protection: UV stabilizers dramatically extend lifespan.
Inspect reinforcement areas: Corners, edges, and tie-down points should have extra layers.
Be smart on colorsoption: Light colors age more slowly under intense UV exposure.
Maintain it properly & regularly: Clean the tarp, avoid chemicals, and store properly when not in use.

Hopefully, this detailed guide will help you choose the right tarpaulin material and size for your trailer, and understand key considerations for waterproofing, lifespan, and color selection.

If you prefer a faster and more efficient way to choose the right cover, feel free to contact Mr. Ted at +86 133 3005 5531. He will do his best to help you select the most suitable tarp for your trailer.

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