I barely thought about the idea of getting a small C or a B that can comfortably fit in a parking spot and unhooking when I go somewhere (hence it being last on my list, almost an afterthought). Looks like that may have the plurality of suggestions so far. Interesting. I hadn't thought about only plugging in the electric hookup, that would make it no less convenient than my electric car (i.e. no real inconvenience at all). I guess they do have large enough holding tanks that I could just add water and empty the black and gray tanks when needed. I am single, so I wouldn't need one that is too terribly large (I'm thinking 18-22' if I go with a C and no larger than a 24' if I decide I really want the Ritz Carlton treatment). Usually it would be just me, or me and a friend or two (and if one friend was a girlfriend, or if the two friends were a couple, only two beds would be needed anyway).
I probably would rent before buying if I go with something that different from what I've done before (or borrow one, my best friend is the business manager of an RV dealer, he may not be able to lend one to me for a weekend, but he can take them out himself and I can go with him). Even if I bought one with that plan (go with a small enough RV to park in standard parking spots), I could also rent a car trailer (for my Ioniq) or dolly (for my Sonata) if I occasionally wanted to bring a car (or test out a TOAD if I thought about going larger later).
For a class B, the cost may stop me (even used, they seem to cost much more than a C). Do you get better workmanship and materials for that cost? If so, that may alleviate some of the price difference. An advantage I can see of that is that you can go a bit more stealth. I am a teacher, and in a few years I want to do a cross country trip over the summer. For some stops that are just overnight stopovers for a few hours sleep, being able to stop in a Walmart (or similar) parking lot without drawing much attention could be nice.
If the toilet is the more commonly offered cassette type we are seeing now, can you handle this?
Oh, that is something to look out for. I'm in better health than I have been in decades (2 years ago I started losing weight, within a year I was down over 100LBS, I've only gained about 10LBS of it back over the past year). However, I had a shower and cassette toilet in my pop up and never used them since they were a pain in the... I definitely want a real RV bathroom, using the drain hose, while a little gross for a short period, seems pretty easy. I'll have to keep an eye out (I thought that was only something I had to look out for on some of the smaller trailers).
Where are you going to keep this vehicle when not using it?
Where I live now, I can't leave anything like that at home (I could store a pop-up in the garage I suppose if I change my mind about another pop-up). I will be buying a new place, possibly next spring, no more than a year or two. However, most places around here have HOAs that ban boats and RVs in the driveway. So, I am planning on needing to store (when I had my pop-up, I had to pay for storage for half the time I had it).