I live in Wisconsin, and have stored all 3 of my campers outdoors. I have a cover, ADCO, that I use every winter. I clean the roof, wash, wax, and winterize. I put the cover on and secure it with the straps and also with a rope. I reinforce the corners with old towels to keep sharp edges from damaging the cover. I have had good luck, no damage whatsoever, and best of all my trailer is clean and ready to go come spring! I would highly recommend using a cover. Just be sure to use a cover meant for campers, they allow ventilation, no plastic tarps!