Rotten Floor in my Outdoors RV

Why, why when we aren't using our RV, it stays inside in my tractor shop. Only time it goes outside is when we use it. Did the same with my last one as well. Sold it at 12 years old, just like new inside and out. Got top buck and no rot. Even the decals on the outside weren't faded.

I see so many RV's sitting outside winter and summer, uncovered, cooking in the sun and rain and snow and I think to myself...You paid all that jack just to let it sit out and rot.