Roving Triker,
If you are truly new at all this, then there's a serious amount of info to take in and consider. Diesels can and do cost more up front, to operate and maintenance. How much more, well that depends on all kinds of stuff. Things like "do your own maintenance", buying things like the fuel, air and oil filters on the best sale you can find. Gas units are cheaper in the fact that there's not near as much oil involved in regular oil changes. The air and fuel filters are normally a lot cheaper etc.
But, all that involves maintenance which, while it does have to be done, is not all that often. The ride, yep, a Pusher is definitely a smoother, better, more relaxfull ride but, you pay for it. You pay for it with much larger tires, heavier rig which, most of the time uses more fuel, but not always. You pay for it in terms of if and when you have to do any maintenance or, repairs on or in the engine area, most Diesel Pushers are one serious pain in the a$$ to get to and work on the engine/components.
And, you say your thinking of a short one, well some of the models have been suggested but, in all reality, there's not very many "short" diesel pushers out there. A 36' is fairly common, a 34' is fairly rare, a 32' is ultra rare and, anything less, is almost non-existent. And, the shorter the rig, ANY RIG, WITH ANY FUEL, the less and less storage you have. And, the interior layout gets really compromised with the shorter units. Sleeping arrangements for more than two, really get tight.
As far as NOT FITTING in SOME campgrounds, yes, that is a problem at some. We've been in our 36' Diesel now for over two years and have traveled to many western states and a ton of private, state and federal campgrounds and as of yet, we've not been shut out of any of them. I'm not sure what they use to determine length limits but we've been in a few campgrounds that had a limit of 34' and we fit in with plenty of room to spare.
So, lots of things to consider. Most of the later Class Cs and As too have fairly good engine cover insulation so, talking while driving is not the problem it was several years ago. Good luck.
Scott
Scott and Karla SDFD RETIRED2004 Itasca Horizon, 36GD Slate Blue 330 CAT
2011 GMC Sierra 1500 Ext Cab 4x4 Toad
2008 Caliente Red LVL II GL 1800 Goldwing KI60ND