Travel trailers spend more time parked than any other RV type, often eleven months a year, and an uncovered trailer ages on fast-forward: chalky gelcoat, cracked roof sealant, black streaks down the sidewalls. A fitted travel trailer cover is the difference between a spring wash and a spring restoration.
The economics are not close either. A roof reseal runs into four figures, and replacing a delaminated sidewall is worse. A cover costs a fraction of one repair and prevents the conditions that cause several.
What actually destroys a parked trailer
It helps to know what you are defending against, because it explains every feature that matters in a cover.
- UV on the roof. EPDM and TPO membranes chalk and go brittle under sustained sun, and once brittle they crack at the seams. Roof failure is the most expensive thing that happens to a stored trailer, and it is almost entirely UV-driven.
- Standing water. Flat-ish roofs pool. Water sitting on a lap sealant joint works its way in, and water inside a sidewall means delamination.
- Freeze-thaw cycling. Water gets into a hairline crack, freezes, expands, and makes the crack bigger. Repeat nightly all winter.
- Black streaks. The runoff stains down the sides are oxidized roof residue carried by rain. A covered roof does not produce them.
- Tree debris and pests. Sap and needles hold moisture against the surface, and mice climb whatever is touching the trailer.
Step 1: measure body length only
The number that matters is the box, not the brochure. Measure front wall to rear wall or bumper, along the ground, and exclude the tongue, coupler and propane tanks. Manufacturers include the hitch in advertised length, which is how people end up a size wrong.
The advertised length of a trailer is often two to three feet longer than its body, because the tongue is genuinely that long. If you order from the model name, you will very likely buy a cover one size too large. Measure the actual box, and remember our travel trailer covers run from 14 to 42 feet.
The full method with per-type diagrams is in the RV measuring guide. Between sizes, always go up: the front, rear and underbody straps pull the slack tight, while a short cover will not close over the rear wall at all.
Step 2: pick the grade for your storage
- Gold Shield 5L RV: outdoor storage in real weather. Five-layer roof, triple-layer sides, breathable, zippered access panels, lifetime warranty. If the trailer sits outside year-round, this is the one.
- Silver Shield 3L RV: mild climates and seasonal storage. Three-layer roof, dual-layer sides, breathable, 5-year warranty.
The deciding question is not climate in general, it is snow and sustained sun. Where snow accumulates on the roof for weeks, or where the trailer bakes all summer, the five-layer roof is worth the difference. For a trailer stored under a carport, or one that only sits out from October to April in a temperate region, the Silver is genuinely sufficient.
We tested both across simulated years of exposure; the results are in how long do RV covers last.
Step 3: install it without wrecking the roof
Most cover damage happens during installation, not during storage. Work in this order:
- Wash and dry the trailer. Grit trapped under a cover for six months will scour the gelcoat.
- Close and retract everything. Vents, antennas, awnings, slides. Anything left up becomes a pressure point.
- Pad the sharp things. The rear ladder cap and rain gutter spouts do the most damage. Use a gutter protector set and a ladder cap, both included with our RV covers.
- Roll it out front to back. Get the cover onto the roof folded, then unroll along the length rather than dragging it over the edges.
- Drop the sides, then strap. Front and rear first, then the underbody straps. A weighted toss bag gets the straps under the rig without crawling.
- Cinch until nothing ripples. Slack is what wind grabs.
Two people make it a ten-minute job. Zippered panels let you reach the door and hookups all winter without uncovering. The full walkthrough is in the travel trailer cover installation guide.
Five mistakes that cost people a cover
- Using the advertised length. It includes the tongue. Measure the body.
- Covering a wet trailer. Trapped moisture with no airflow is how you get mildew on the sidewalls.
- Skipping the gutter protectors. Gutter tears are the most common warranty claim we see, and they are entirely preventable.
- Leaving the cover loose. A flapping cover abrades gelcoat and destroys itself in one windy season.
- Storing the cover damp. At the end of the season, dry it fully before it goes in the storage bag.
Frequently asked questions about travel trailer covers
Do I include the tongue when measuring my trailer?
No. Measure the body only, front wall to rear wall or rear bumper, and leave out the tongue, coupler and propane tanks. Advertised lengths include the hitch, which is typically two to three feet, and using that number puts you a full size too large.
I have a toy hauler. Is it the same cover?
Same length rule, measured with the ramp closed and latched, but a different pattern. The toy hauler cover is cut for the squared-off rear wall and drops cleanly over the closed ramp door. See toy hauler covers here.
What about a fifth wheel instead?
Different shape entirely, because of the raised front cap and the overhang. See our fifth wheel fit test and fifth wheel covers.
Will the cover flap in wind?
Not if it is cinched properly. Elasticized hems plus front, rear and underbody strap tension keep it planted. Flapping is a symptom of slack, so if you hear it, the straps need tightening rather than the cover needing replacing.
Can I leave the cover on all winter with snow on it?
Yes, that is what the Gold Shield 5L roof is built for. Sweep off heavy accumulation if you can reach it safely, mainly to reduce weight and stop meltwater pooling, but the cover is designed to sit under snow.
Do I need to remove the cover to get inside?
No. Both grades have heavy-duty zippered access panels at the front, rear and sides, so you can reach the entry door, hookups and storage bays without pulling the cover off.
Is a breathable cover really better than a waterproof tarp?
For a trailer, decisively yes. A tarp traps every bit of moisture that evaporates off the roof and holds it against the surface, which produces mildew and accelerates delamination. Breathable multi-layer fabric sheds water from above while letting vapor out from below.
How long will a travel trailer cover last?
Gold Shield 5L carries a lifetime warranty and Silver Shield 3L carries five years, with a prorated replacement schedule after the first six months. Real-world life depends mostly on sun exposure and whether you padded the gutters and ladder. Details in how long do RV covers last.
Should I put the cover on if the trailer is stored under a carport?
Yes, though you can step down to Silver Shield 3L. A carport blocks direct rain and most sun, but dust, pollen, bird droppings and wind-blown debris still reach the trailer, and covered storage is where a lighter grade makes the most sense.