Jon, a lot of the rules were written based on crashes and litigation.... 2 wheel guys write most of the 2 wheel rules, although streamliners fall under the car safety rules so there is a mix. Rokon (?) made 2WD bikes way back when, good rough trail bike that went a little faster than walking speed, fell over a lot
I know some guys that built a rear wheel steering streamliner back in the 70's.. crashed it 2 years in a row with 2 different rear wheel configurations... the second time it crashed the video shows it barrel rolled 6 times in the air... the front wheel steering rule showed up in the book a year later
cool car though.... if I dare say...