Got the idea a few years ago and of course a quick search and I found you could buy them already... to the tune of $100 or more like this one from TSC:
Since we moved to the bigger place now I park the popup in the back lot and it is too far to pull by hand so I wanted to get one that I could hook up to the GT. Of course I could just put a ball on the back of the GT and that is exactly what I have been doing. But the tongue weight on the little popup is more than I care to lift if I don't have to. So I made me a dolly. $6 for the wheels, $5 for the tube, $3 for hardware... total of $14.
Edited by twostep, June 06, 2013 - 11:26 PM.