In my opinion, how necessary a separate vehicle is depends to a large extent on how frequently you move to different camp sites. A toad is a lot less necessary for a long tour than for a medium-length stay at a single place. If you're moving every couple of days, it's not so hard to make a stop on the way to get groceries or whatever.
I got back about a month ago from a ten week trip to Alaska. The closest thing I had to a toad was a bicycle on a rack on the back of my class C motorhome. There were a few times it was very handy, but I didn't really need it the vast majority of the time. (There were other times and places that, if I could have been on a slower schedule, I would have very much enjoyed using it for recreation.)