Do you cover or not while storing?

I cover our 96 Southwind every winter. I've had no problems with mold or the cover rubbing the paint and, we get a lot of winter wind on our area.
There are different opinions on covers for RV's. Use the search feature on the forum, you will get a lot of reading.
When this one wears out, I'll buy another cover. JMO

I used to cover our old PUP the first few years we had it. Then a storm tore it up. I never bothered to replace it. We had our last HTT (Jayco Kiwi 17A) for 10 years and never covered it. I did cover the tires and the A/C unit. Kept it waxed and the roof clean and aside from some fading on the front bed door it looked great when we traded it in. I do not plan to cover our new HTT either.

Do not use a blue tarp. They cause more problems then they help.

If you want a cover get one that is breathable like Sunbrella. As stated above, not covering your trailer works okay,after all,
they are built to be outdoors in the weather. If you can store the trailer under roof, like a carport, and let the air circulate around it would be excellent. Also, add roof vent covers and then open the roof vents part way to allow for the inside air to circulate.

We store ours under a call port. November thru March. The remainder of the year it is loaded and ready. We keep the side jalousie window open and do not cover it. Rain is not the enemy, watch for fallen tree limbs, and damaged caulk.

I used to cover our campers all the time. Then I realized that every three to four years, I was replacing the cover due to tears from the wind. This can get expensive. Now, I just clean the roof and wax the camper in the Fall and Spring.
As stated, campers sit in the sun and rain all summer so some snow on it during the winter doesn't bother me. I do keep a very diligent eye on the caulking and fix immediately upon seeing cracks.

Next year will be my 6th with Adco Tyvek. I've been very happy with it.

any cover is better than none myour roof won,t leak under a cover and the sun won,t eat up the rubber. but you gotta let it breath.

Or not

I'm on my 2nd cover, get the better quality one. Getting it to not billow in the wind is essential to have them last at all. I also tip the trailer towards the rear for better run off and carefully take the snow rake to it if it gets deep. It also helps if you can somehow soften the sharp spots, I used carpet strips, works well but is a hassle the first time and adds a good deal to the time it take to cover it.

Have had three TT's over the years. None ever covered, and we live in Colorado high country. All three sold for over book. See no reason for covers.

DO NOT use blue tarps, they do not breath, and so cause a real mess.