I didn't like the idea of hand launching a 2m (80") wingspan rc plane with a pusher prop to chew up my hand so adapted an existing dolly launcher design. I used the sides and wheel arms and upscaled them by 170% from the original but connected the 2 side with 2 x 2ft lengths 5/8" of threaded rod from Home Depot to separate them and provide clearance for the prop. The wheels are 4" plastic stroller wheels from Amazon. 1/4 bearings in the arms help reduce resistance. I have still to test this out.