Join Date: Jul 2008
Location: Saint Louis, Missouri
Bikes: '09 Rodriguez Adventurer Custom, '08 Trek 7.3Fx
FX7.3 can hold some very wide tires, 40C with fenders, at least. I've ridden mine for about 800 miles (rough guess,) at 250-265lbs towing a 100lb trailer on rail-trails. It's held up great. I put 700x37C tires on, smoothed the ride out a lot.
Rear wheel needed trued once shortly after purchase, but that's standard for most bikes.
I did stick a nashbar touring bar and some ergon grips on it. The bike is far to small for me, so I couldn't ride for long without that change.
No broken spokes, but my shop checked the tension when they re-trued the wheel, may of helped.
Getting a 36+ hole hand made rear wheel seems to be the best way to go for us heavy folks. Although you should be fine with a properly tensioned 32 spoke wheel. Might ask the shop to re-build with a better rim if they start breaking.
Lift up on rough bits and don't jump off curbs though.