To be honest, you're in a better position to make that assessment for yourself. I won't say you're in a situation like 401 lb Nate Newton, heck you might even be solid muscle mass like a body builder and there is virtually nothing there to lose ? In either instance or somewhere in between though and I know you already realize that at your size that you can destroy a frame at a moment's notice, you'll temper how aggressive you are with any type of riding with common sense.

http://sports.yahoo.com/nfl/blog/shu...urn=nfl-282606

Edit: that one video, that guy came down on his back wheel just on the incline side of the mound, it was too easy to see why that frame snapped like a twig. 1/2 the bike was moving forward with all that momentum & mass while the rest of it was stopped by the mound of earth. That frame got stretched instantaneously.