I agree with those who say floor plan first. If you decide you don't like it you won't keep it. I stayed under 34 feet so I went gas and am happy with it. Any longer and I would probably prefer diesel but for slightly different reasons. Most freightliner chassis have a slightly tighter turning radius than the Ford which can be helpful. Also the front axle is positioned further back on the diesel which helps with weight distribution. Especially on the heavier coaches. I've never had a problem finding fuel stations but the truck pumps must be a comforting option for larger units. Both options gas and diesel options are very capable if not overloaded. I did drive some diesels as well but I really didn't notice that much difference in ride and handling and since I drive only around 5000 miles a year I didn't want to pay up for the diesel. There is no right or wrong here as long as you stay within the weight limits of whatever you buy. I would focus on floor plan and let that drive the fuel type of the coach.