Same question years later; Sun EZ, which I "inherited" from younger family members (I'm mid-60s) in hopes I can ride without exacerbating carpal tunnel. All fine except starting uphill. That's where I'd like retractable training wheels -- or even an easily retractable pair of skids, props like kickstands. Streets are too narrow for the "start downhill and U-turn" and I haven't found an electric boost that would be good for the three or four seconds I need to get the thing moving.

No problem spinning fast in lowest gear to keep moving uphill -- once I'm moving fast enough even up a moderate hill I'd have the half second I'd need to 'retract' an outrigger of some kind.

Yeah, I know, get a trike. Or move to less hilly neighborhoods.

Just surprised there's no solution to this, and I haven't even come across anyone who describes trying to make it work -- just people saying why it won't or can't or needn't work.