he should be fine regardless of what its rated for, i know guys way bigger than him with girlfriends much bigger than his and i've never heard of a bent subframe other than in a wreck... maybe if both of them were closer to the 500 lbs range each then i might worry

and your weight isn't really the problem, i would lower my 2003 gsxr(newer stiffer suspension) for the drag strip and i weigh only 135 lbs, so i would load the suspension less than you, and my undertail still rubbed, so if your bigger than me and your suspension is softer and has more miles on it i'd definetly expect for your undertail to rub if its lowered