Ankh, the landing gear you're looking at on the WISL site is meant for 2-wheeled streamliners. Streamliner pilots have no way to put a foot down when they stop. The landing gear isn't meant to be training wheels, it's strictly for stopping and it goes up once they get rolling. And, it's used by some very experienced 'bent riders.

The term, 'training wheels' is an oxymoron. They don't train you; in fact they actually impede the learning process.