Brian you have a cool setup, I dont think you have anything to worry about. I have a 10 X 20 canopy over my ride, and that is just plenty. When I am done for the season I spray the crap outta it with the good ole WD40, the engine that is, unless I have the stuff from work, hehe, but other than that, I have a boat cover that I use ocasionaly, and I put towels over the seats and the back seat, and then I put my little tub of anti-mildew-moisture thingy bob in and I am good to go. But dont use it often, just like it to breathe. Just my .02 bud Mark