I have a Trend that's 24 feet long from front bumper back to the itty bitty hitch. So yes, big dogs in small motorhomes do work. My lab Bailey is close to 100 pounds. We can both have our feet on the floor at the same time, but he does have to back out of the bathroom doorway since he can't turn around. And he knows he doesn't fit in the bathroom so the doorway is as far as he can go. ;D He loves traveling, and I like having a very large and deep bark when I need it. He thinks he's the walmart greeter at campgrounds.