Google El Monte RV Sales, they might not be as close to you as CA but they include a lot more than CA. They have a list of things they do before selling and new mattresses are one of them.
I agree with renting first and seeing what you like. My DW(Forum talk for Darling Wife) thinks smaller would be better and I think a little longer is better. Now if we could afford a Winnie VIA, I could go smaller, I think. To me 32 feet bumper to bumper or the average 30 foot model is what I like. I'm hoping to get her in a smaller rental for a week. Most small "C"s have corner beds or only the cabover bed. It's not for me but She who must be coddled thinks it would be okay.
Look a lot and rent a couple times, then look a lot more.
Come back and ask more questions.
