I know, old thread, but figured better to add to it than start something from scratch.
I have the same issue but was thinking about solving the sweat problem by riding the bus there. Where I live, sweat and humidity are major issues.
My idea was to sew an aluminum sub-frame into an existing massage table carrying case with a folding tongue and popoff wheelchair wheels then carry the table onto the bus with me while the bicycle rides on the rack. Thoughts?