Solar panel system advice/personal experiences please

My memory didn't fail me, you roof is not like on typical travel trailer. Looks like aluminum or fiberglass sheet, probably there is no 1/2" particle board underneath, and no massive rafters.

Tilt while in storage... I don't know. I did just the opposite - disconnected one of my two 250W flat panels, so there wouldn't be any high current running in my absence. Next time I think I won't disconnect it, because batteries in storage are floating and will draw very low current, be it with 1 or 2 panels.