[skyking]

Originally Posted by rumdog

Batec Mobility - Add-on handbikes for wheelchair: manual and power handbikes easy to attach to the wheelchair. Revolutionary anchoring system - Batec Mobility - Handbikes acoplables para silla de ruedas: acoples para silla de ruedas, propulsores para
For once a year this would be overkill, but my buddy has one of these.... actually thats him on the lake pulling his kids. He uses a studded tire in the winter. May help with the creative juices!

sand is the hard part.

Yes it is. That is why I was thinking a pair of rear drives on 26" fat wheels, and some larger and wide front casters. I can fab all that up in aluminium to keep weight down.
I think the batec would spin out trying to drag conventional wheels through anything dicey.