Stephen: Some peds are better built for off road conditions than others. Free Sprits are excellent for such things because of their sturdier construction and better suspensions, being a step thru frame is a huge bonus when you eventually have to bail out too. (hint: if you're gonna dump, put the exhaust side down)
Really like the Hobbits & all but I'd never trust one off road — subframe is too flimsy and their shocks are merely average, belt drive really sucks when they get wet.
I loved off roading, but haven't done it in a while. They tend to fence off construction sites around here.