I just bought a new set of 36h Mavic Xe 729 Dish wheelset with Shimano XT Disk Hubs off of e-bay for my Trek 6700. I took them to my LBS and had the tenson checked on the spokes and the LBS said that they were only 15 gage spokes but very strong rims that downhillers use. I was wondering if they would be strong enought for a 275 rider hauling about 70 to 100 pounds of gear, or maybe just pulling a Bob Yak with most of my gear in it or both. I will be riding rails to trails, roads and un-paved canal paths as well, and a little mountain biking trail riding along the way if I see any. By the way, my LBS said they should be strong enought but I want to ask here too.