If and when we buy another 5'er, I will buy used and shorter than my current 40' length. Used ones have already taken the big depreciation hit and, in theory, have had some of the kinks worked out that my new Cougar came with. I have found 40' to limit our spot finding options most places.

Well, it is all about the floor plan. Have your rented and experienced enough to be confident of your choice? It is not uncommon for people to discover shortcomings in the floor plan after a year of use. If you are risk averse, you might buy used until you know for sure what you want.

I'll keep this relatively short.

I'd buy new. You never know how a used one was maintained. One bad winterization and you're in for some expensive repairs. Somewhere around 30% off MSRP is about right. Yes, Camping world is crap. Once you drive of the lot you are dead to them. And when buying new, no matter what brand you buy, you will have warranty issues. ALL campers have issues. Some more than others but you will be back for warranty work no matter what. It's all about the dealership. So research the dealer just as much as the camper itself. Being aligned with a good dealer who will go after the MFG and actually take care of issues is what is important. I'm getting a Grand Design 5er this winter. I've heard tremendous things about their customer service and I know the dealer here in southern NH will take care of any issues I have.