My situation isn't quite the same as yours, I'm a solo full-timer, but I have a travel trailer + truck instead of motorhome + toad. I don't know much about the tow capacity of various motorhomes, but I do want to say that a small RV you can leave behind with a regular vehicle that you can drive around in has been a great combo for me.
I travel in such a way that I park the RV for longer periods of time and then explore the area in my truck and that sort of traveling favors having a separate vehicle. Having just a small motorhome favors the kind of traveling where you're always on the move, then like a previous commentor said you just do your shopping in transit. Which is the "better" option depends on what kind of traveling you like to do imo.