First season using this on an A-Frame camper/trailer. Just about 45 days of use and the snow season seems to have arrived earlier than usual this year. So far the cover has held its own through sun, wind, rain and now snow. My trailer box itself is about 13.5ft with the mounted spare and the 12-14 size seems to be a decent fit and does have some additional room. It includes a patch kit that I hope I don't have to use. It has plenty of attached strapping material to tailor your fit and which again has held firm under windy conditions. I haven't tried it but I may be able to cover the front battery box as well, not sure about the twin propane tanks.The side zip access area worked well when I had to slip in the trailer to retrieve a needed item. It would have been even better to have the straps snap on the door access side vs the opposite side but that's a minor issue.A few notes; be sure to tape or cover any sharp edges on the trailer prior to covering. I used some painters tape in suspect corners, ideally more of a padded or foam material would be better to reduce the risk of damage to the cover. The water-resistant feature is great but this translates to water pooling from rain or melting snow. I placed some raised material on the trailer roof under the cover to help displace the water. I could benefit from more, otherwise some manual squeegee intervention is needed.Side note; I installed the cover solo but an additional pair of hands would definitely help. If its windy you may want to try when it lets up. Also, my particular cover has the main logo on the rear vs the front of the unit contrary to the Walmart photos and install instructions. It's early yet but so far so good.