- Choose UV Hydro if you open the trailer during storage: zip doors on both sides, ladder cap, 4 gutter spout covers, 3-year warranty.
- Choose Storage Lot if the trailer sits unattended for months: UV-treated 4-layer polypropylene and cam buckles that resist strap slippage.
- Both are 4-layer covers in the same 15'1" to 18' band.
- Storage Lot comes in more lengths; UV Hydro has the richer feature list.
UV Hydro vs Storage Lot comes down to one question: how often will you lift the flap and go inside? Both ADCO covers use a 4-layer fabric and both are sold for small travel trailers of 15'1" to 18'. They are built for different storage habits.
Below we compare the white UV Hydro travel trailer cover with the tan Storage Lot 74839 in that same band. Specs come from the listings; where the 74839 listing is thin, we use the shared Storage Lot line description.
ADCO Designer Series UV Hydro Travel Trailer Cover
ADCO by Covercraft 74839 Storage Lot Cover for Travel Trailer RV
UV Hydro vs Storage Lot: spec table
| Spec | UV Hydro (15'1"-18') | Storage Lot 74839 (15'1"-18') |
|---|---|---|
| Fit | 15'1"-18' (180"-216") | 15'1"-18', listed 216 x 99 x 90 in |
| Fabric | 4-layer, UV resistant, hydrophobic barrier | 4-layer polypropylene, UV treated |
| Built for | Various climates, moderate wind | Long-term storage lot use |
| Zip doors | ✓ Both sides, red pull accents | ✗ None |
| Strap lock | ~ Not detailed | ✓ Cam buckles |
| Corner cinch | ~ Not detailed | ✓ Slip-seam on all 4 bottom corners |
| Ladder cap | ✓ Included | ✗ Not listed |
| Gutter covers | ✓ 4 spout covers | ✓ Gutter protectors |
| Storage bag | ~ Not listed | ✓ Included |
| Warranty stated | ✓ 3 years | ~ Not listed |
| Color | White | Tan |
The pattern is clear on paper. UV Hydro wins on access and extras. Storage Lot wins on hold-down details for unattended use.
Note that the comparison uses the line description for the Storage Lot 74839, because its own listing has very little detail. The shared features of the Storage Lot line are identical across all seven bands we list.
Fabric and weather protection
Both covers use four layers, so the difference is in the finish. The UV Hydro listing describes superior UV resistance plus a hydrophobic water barrier, and says the cover is built for various climates and moderate wind. It also claims to reduce washing, waxing and roof treatments by keeping the roof clean and cutting black streaks on the sides.
The Storage Lot line describes durable 4-layer polypropylene that is UV treated for long-term use on a storage lot. It does not list a separate water barrier. Its focus is surviving months of sun and wind with nobody around.
In short, UV Hydro is a weather cover first and an access cover second. Storage Lot is a long-haul cover first, with weather protection tuned for months in the open rather than for a damp week between trips.
Access vs hold-down
UV Hydro: get in without undressing the rig
Zipper entry on both sides supports slide-outs in storage, and red accents show where to pull. A ladder cap cover is included to cut wear where the ladder rubs. Extra reinforcement throughout is said to reduce snags and tears.
That matters more than it sounds on a small trailer. With a cover on, the only way to air out the interior, top up a battery or grab a forgotten camp chair is through a door, and UV Hydro gives you one on each side.
Storage Lot: stay tight with nobody watching
Cam buckles lock the straps to prevent slippage during unattended use. The patent-pending slip-seam system cinches all four bottom corners to help keep wind from getting underneath. A storage bag keeps the cover tidy off-season.
For a trailer on a remote lot, those details are the difference between a cover that stays put through spring storms and one you find draped over the hitch.
ADCO Designer Series UV Hydro Travel Trailer Cover
Check price →ADCO by Covercraft 74839 Storage Lot Cover for Travel Trailer RV
Check price →
ADCO Designer Series UV Hydro Travel Trailer Cover 20'1" - 22'
Check price →Size range: which line fits more trailers?
If your trailer is longer than 18 feet, both lines offer more sizes, but not the same ones. Here is the longest trailer each size fits, for the bands in our catalog.
Band top end by line
Longest trailer per size listing, feet
The Storage Lot line covers trailers from under 15 feet to 37 feet in seven bands. The UV Hydro travel trailer covers in our catalog stop at 22 feet, though UV Hydro also comes in fifth wheel, toy hauler and Class C cuts. For a deeper look at the lot line, see our Storage Lot cover review.
Small trailer storage: practical tips
A 15 to 18 foot trailer is light enough that one person can often manage the cover, but the fitting routine still matters. Choose a calm day and work from the front of the trailer to the back.
- Prep the roof: wash, dry and check for anything sharp, like an antenna base or a loose vent cap.
- Cap the spouts: both covers ship with gutter covers of some kind. Fit them first so the spouts cannot pierce the fabric.
- Mind the ladder: UV Hydro includes a ladder cap cover. With the Storage Lot cover, pad the top of the ladder yourself.
- Tension evenly: on the Storage Lot cover, snug all four corners before you lock the cam buckles.
Small trailers often store in tight spaces, such as beside a garage or between other rigs on a lot. Leave enough room to walk around the trailer, both to fit the cover and, with UV Hydro, to reach the zip doors on either side.
When the season ends, let the cover dry before packing it. The Storage Lot cover comes with a bag for that; with UV Hydro, a large tote does the same job.
How to choose the right one
- Count your visits. More than once a month during storage favors UV Hydro.
- Check where it parks. A remote lot favors Storage Lot's cam buckles.
- Measure bumper to ladder, hitch excluded, and confirm the band exists in your chosen line.
- Factor in extras. UV Hydro's ladder cap and spout covers are in the box.
Still weighing fabrics? Our AquaShed vs Olefin HD comparison covers ADCO's other two Designer roofs, and the best travel trailer cover roundup ranks all four lines. Winter storage tips are in our winter cover guide, and tire protection in our RV tire cover picks. Every size is listed in the travel trailer covers catalog.
For a 15 to 18 foot trailer that you use or check on during the off-season, UV Hydro is the stronger package on paper: zip doors on both sides, a ladder cap, 4 gutter spout covers and a stated 3-year warranty. For a trailer that goes to a storage lot and stays there, Storage Lot is built for the job, with UV-treated fabric and cam buckles that keep straps from creeping. Match the cover to your storage habit, not to the spec sheet length.
FAQ
UV Hydro vs Storage Lot: which is better for a small trailer?
It depends on access. UV Hydro suits trailers you open during storage; Storage Lot suits trailers parked unattended for months. Both come in the 15'1" to 18' band.
Does the Storage Lot cover have zippers?
No. The Storage Lot line has no zip doors. The UV Hydro cover lists zipper entry on both sides.
Which cover has a warranty?
The UV Hydro listing states a 3-year manufacturer warranty. The Storage Lot 74839 listing does not state a term.
Are both covers four layers?
Yes. UV Hydro lists a 4-layer design with a hydrophobic barrier; Storage Lot uses 4-layer UV-treated polypropylene.
Can I use UV Hydro on a storage lot?
You can, but the Storage Lot line's cam buckles are designed specifically to prevent strap slippage while the trailer sits unattended.