We went from several long TT's to a C like you. Fuel stops, both TT and C, are and can be challenging. We too used a gas truck to tow our TT. Here are the pros and cons from our viewpoint:
Pros:
--with onboard generator, we can take the dogs and do an hour or 2 at a museum or restaurant, and leave the AC on.
-- don't always need a dinghy (spare car). Sometimes we just go to state parks an hour or 2 away and don't need to hook up the Jeep behind us.
--We've went to state parks that have no camping, but wildlife (bison roaming the prairie at Wildlife Prairie park in IL)...and our C is great to take for AC and rest/lunch locations.
--hydraulic leveling; had it installed on ours and it works great
CONS:
--when pulling our Jeep, if I need to back up, I HAVE TO UNHOOK. You can't back up with a car/jeep out back. perfect straight is one thing, but plan your turns and entrances/exits (just like with a trailer)
--loss of floorplan space. our TT had HUGE amounts of space ... the C has no bunks, but the overhead bunk and tables to turn to beds...which is fine but some kids love "their own space"
--another engine/trans to take care of...that you most likely won't drive a lot. Plus the genset. We use as much as we can, non-ethonal fuel to avoid issues when sitting