When I bought my RV I test drove a gas and Diesel . When I drove the diesel the air ride suspension sold me. Plus the diesel power to tow an enclosed trailer. I get 7 to 9 miles to the gallon with the diesel. My enclosed trailer is 32' with a 5' tounge which is important for clearance when turning. My RV is 37'. You'll be happy with a class A or C but my choice for the extra room and the fact you can put alot more miles on a diesel is a Class A. That's important to me because I don't think I will ever sell it. I also haul a 3400 lb car, alot of tools, cabinets full of parts and a golf cart. Alot of great deals out there so spend alot of time looking. It took me 3 months. What ever you buy you'll love it and wish you did it a long time ago. It's great comfort at the track and vacations.