This is one thing I'm planning for my next rig -- my TT is nice, but there is something about having a motorhome small enough for use as a secondary driver. When I rented a "B" a couple years ago, I found a few nice uses for it, other than the typical motorhome function:
1: A place to stash groceries and keep stuff cold.
2: It made long trips bearable because I could just pull over into a parking lot, buy something, get an hour or two of shut-eye, get back on the road.
3: Get to a festival in a small town in the wee hours of the morning, find a nice place to park, go back to bed, then wake up, shower, get dressed, and be ready to go.
4: Save cash eating out. I dislike eating at fast food places, so being able to park, toss something in the microwave, eat, and get back on the road is a blessing.
5: Take to work, if possible. After work, hop in, vacation starts.
6: After seeing the doctor, getting a shot, it is great to have just to lie down to ensure no acute reactions.
7: As mentioned above, an anti-DWI vehicle.