Yep - I just meant that I'd not used it for or with a BOB.

It would be optimal for hauling a fair amount of stuff wherever you've got enough snow and you're not going through really steep terrain. Definitely more efficient than a pack in the right conditions.

I've only personally hauled 50 lbs or so with the ones I built - easy except on steep traverses or downhills (both of which can be somewhat mitigated by design features such as keels or fiberglass rods for the pulls). I could easily haul twice that - and I've read about folks on arctic expeditions hauling over 200 lbs (but over fairly level terrain).

Here's a good site with some info on making your own, and he also sells good kits:

http://www.skipulk.com/