Wasn't sure exactly what forum to post this. I'm looking to store a 26' travel trailer in the Brighton, Mi area for a month or two starting in May. Somewhere there or withing 25 to 50 miles would be ...
Or do a google search for RV storage in (the area you are interested in). I see more and more RV storage facilities, one a mile away from here, recently. They have fences and a security system of some sort. Campgrounds just park the stored RVs somewhere on the back forty.
A quick look online shows at least three and maybe more in that area.