We tow a 2000 Jeep TJ Sahara. Transfer case in neutral auto tranny in park, key turned to first position to unlock steering and away you go. I can't even tell its back there when towing. A good 4x4 will extend your exploring capabilities.
I have a 98 Country Coach Diesel pusher. I never owned a gaser. I do like how quiet it is having the engine in the back. As for maintenance, my Cummins holds 7 gallons of oil, the oil filter is huge, I have 2 fuel filters, a large air filter and a coolant filter. So the basic maintenance is going to cost more but the longevity of the Engine and Tranny is well worth it. I have the Allison 3060 Tranny, I had the fluid and filters changed at an Allison Shop and when I was leaving they said see you in 300,000 miles. That tells a story right there. For the larger and heavier class A coaches you can't beat a diesel. They are built to run, built to work and built to last. Why is it you don't find gas engines in 18 wheelers.