Jackson has some kindergarten friends who have rigs like this, so Alison relented and Choak at Carbondale Cycles ordered us up the Trek trailer! I went with the single speed model (they make another with SRAM 6- speed mix). When Jackson can figure out gears, he should be riding on his own. I’m not sure about doing one of these trailer things as a faux tandem for serious riding. It seems to put a bit of stress on the seatpost, and I don’t think I’d want to do 40mph descents on it. Fortunately, ours is hooked to the 1978 Schwinn Le Tour De Luxe, with Blackburn Steel seatpost. We probably won’t need to hit 40 on the way to school. We put in a solid 12-15 miles today on it! Jackson’s got the power!