Just had a quick look - the ones I found aren't recommended for people over 165 lbs, and apart from that....jumping? On a trampoline? If you're overweight? Even *if* there were trampolins that could withstand the weight of peeps weighing 250 lbs and more (and even the professional ones don't do that), do you know what using a trampoline will do to your ankles, knees and hips?? You might as well use a sledgehammer and wreck them, at least it'll be fast that way.
Some people.....*walks away muttering to herself*