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I cover it every time it isn't being used with a metal roofed pole barn. Also hooked up to 50 amp full hookups.

Any cover will protect the roof and sides from sun damage. Doesn't make any difference what a dealer does since they don't plan to keep something that long anyway. As far as full timers, that's the cost of doing business but I'll bet that all would park under a roof if they had that option.