DaNag, some very good thoughts. I've considered almost all of them. The cost of a Class C is considerably more, considering that it would be parked when not traveling, would require an extra registration and insurance, and the cost of another vehicle to drive.
The Sprinter will take my wife and I and another couple to dinner, park in an ordinary lot, carry bulky items through the rear doors and on top of the bed, and do it all with better fuel mileage than my current Windstar! It can also replace my truck considering that I already own two flat bed, open trailers -- one a tandem axle 16' and the other a single axle 10'. Hook up the trailer and pull the tractor, or a small car, or anything I need to pick up at the box store.
The trailer I described above was strictly for RV travel -- it would be my garage (golf cart and motor scooter), storage shed (outdoor furniture, fire pit, grill, etc.) and closet. I like gadgets, and was planning to pull a trailer behind the diesel pusher we were planning to buy -- exceot that trailer would have been a little larger and carried a Miata instead of a motor scooter.
I have considered the new truck and a 5th wheel trailer. In fact, that's probably how I would have gone if I hadn't discovered the Sprinter-based Class B's. It eliminates an extra vehicle and insurance. One of the difficulties, however, is that I can't figure out how to take along the golf cart, and I need the cart for transportation around an RV park because of my health problems. Another is that the fuel mileage is just not good enough, not only while traveling, but also while daily driving. Finally, maybe my taste is too expensive, but I'd be hard-pressed to find a newer F250 diesel and a newer 5th wheel for $50K -- I looked at 5th wheels that ran over $100K new, and a new F250 would be over $40K.
I'm well aware of the "hit" we'll take on a new RV financially. I was planning to buy a year or two year old diesel pusher for that reason. And, I'm aware that from an accounting standpoint, it doesn't make sense to spend $85K for a vehicle to save maybe $1,000 per year in fuel when there are less expensive alternatives.
But, there's a principle involved. I simply refuse to take part any longer in the senseless over use of energy resources. There are really only two alternatives for me: use less fuel and still travel, or don't travel. The money is important but secondary.