Need sugestions from my family

[Fla 66 cuda]

I have a few years [8] till i retire but i plan to become a snowbird when i do, we are planning on purchaseing a racecar hauler with living quarters as our retirement home. I was born and raised here in Florida [except for my military travels] i'm tired of the extreamly hot summers and warm winters,flat scenery ect. I want to find an area to go to that has a cooler climate during the summer. I'm sure that California and Alaska are out of the question. I have been up the east coast and across I 10 to Cal. and Flagstaff was nice also the cooridor of I 75 up thru Tenn./Kty. was nice as was Greenville S.C. but that was long ago and i'm sure things have changed. Any sugesstions would be helpful.