We just returned from 14 days in a Winnie 70C on the Sprinter chassis - two of us and 50lbs of dog. We did better than we expected and better than the dog. I wasn't going to downsize to a B until Winnie came up with the 70C with the slide-out. That puts the living/sleeping room at the front instead of the back, adds storage, and provides a full bath with separate shower. I was surprised at how easy it was to live in. I was thinking that if I was single (no intentions, BTW), I could probably do OK with just the Sprinter and a motorcycle on a trailer. But I'd travel to where I could be outside as much as possible or at least have the 'screen door' open. Here's the only two negatives I found:
1) You have to be willing to button up the unit to go to the store or to a movie or restaurant. Not a biggie, but it takes more planning. That's why I'd have a trailer and motorcycle - just to run out without having to pack up the van.
2) With two of us, if one wanted to go to bed and the other wanted to stay up it was a hassle. But we worked through it and if single the problem goes away.
1) Easy to drive and put on longer distances. Parks anywhere, fuel up anywhere. Great advantage.
2) A surprising amount of storage - clothes, food, grill, outdoor chairs & table, two sets of golf clubs, hoses, wires, etc.
So if I was single, yes, I could do it. But with the motorcycle caveat and the point that you like to live simple.
Niel & Carol Powers
Winnie Era 70C