Nothing against buying an older Class C at a good price, but the OP's idea here is not a good one IMO.
With ours it took a few short trips over the first six months to get it in shape. Right after buying it went in for a mechanical inspection where it got a few things done. Even so, it had to be towed twice; one time to get a new starter, second time it was burst hoses under the doghouse-no water would stay in radiator long enough to drive it.
After the first six months it has been great except needed new tires--of course it was an inner back tire that went flat.
So the one "dream trip" is likely to be when all the fun happens. :(
You will wear out your Good Sam Emergency card.--and don't leave home without one of those!
The RV house stuff will have problems that mostly you can fix yourself, except you might have to order parts from Amazon. How to do that on the one dream trip?
So IMO don't do that. Suggest you are a good candidate for renting a Class C same as those European tourists do. If you meant to buy it and stay local doing short trips here and there, then yes.
