To seal the gap you could design a gasket like an inflated inner tube, with a release valve that would let air out when pinched in a turn, kinda like a bounce house for kids. This bag could be inflated with exhaust gas.
As far as using bicycle tires for the trailer, I use to build mini choppers with 20hp engines that achieved speeds upward of 90mph. Our first obstacle was the front tires. At first we used standard bicycle tires and were melting bearings @ high speeds. In the end we found high speed sealed bearings that would fit in the rim housings and all problems were solved moving forward.
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Thx NoCO2; "The biggest FE mod you can make is to adjust the nut behind the wheel"
I am a precisional instrument of speed and aeromatics
If your knees bent in the opposite direction......what would a chair look like???
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