This comes with pictures so I can explain what I mean Not to scale The blue thing is a wheel, the gray box is the house, and the white box is the run. Anyway, I'm thinking there are two advantages to this. One is that the wheels can be flush with the bottom of the run portion, thus allowing the whole thing to sit flat, but the run will clear the ground when you lift that end to wheel it. The other is that the weight of the portion of the house that is beyond the wheel should act as a counterbalance to some of the weight on the run side. You'd still have to push that weight, but you wouldn't have to lift it. One con to this design, of course, is that you lose area that could have been used as run space. Thoughts?