The quota is very heavy for offroad, but it can be done. In stock trim, they suffered from surging at low rpm- incidentally- they have a single intake injector. I've heard the stock seat is typically unbearable as well. Quirks aside, they are fun to ride and really tall. And all the details like surging are easily addresed.
For 'off roading' or even dirt trails, I'd go for a true dual sport. I've got a KLR650 that I flog around. It is way too heavy and archaic for technical work, but man, is it ever fun. They're a lot cheaper than Quota's also. Speaking of which- I've seen several for sale recently. There's fellow in OK, who's name escapes me now, selling a quota (was in MGNOC newsletter). I've known him from rallies for a couple years and I know he's compulsive- so that would be a bike in good shape. There's several listed on the mgnoc site as well.