My personal experience is that covers are more hassle than they are worth. Add to that they can scratch your paint or rub the finish. Getting them off for a mid winter trip is also a less than pleasant experience. But that's my experience, some have luck with them. Indoor storage is utopia. If you have concerns, voice them to the owner of the facility, document the condition of your MH, make sure he is not to move it without your consent and make sure he understands he's liable if anything were to happen to it under his control. MH's are made to be outside, so storing it outdoors provided it has a good wax and preventive maintenance shouldn't be an issue, but indoors it certainly mitigates almost 100% of that. And it never hurts to shop around for other places to store it. I've often thought about driving around and asking local farmers, industrial complexes or anyone with a barn or warehouse to lease the space in winter. Airplane hangers are also worth checking out.
