Well, my TC18 is at 265 hours over about 6 months, in 4WD all the time, going through deep mud a pretty good amount of it, often with a full loader, and I built that moster 6' wide root rake for the bucket which puts one heck of a strain on it when I'm digging -- I've lifted the loaded rear wheels off the ground many times, even with the box blade and additional weight on it -- I think some of my bucket pins are worn already -- never had the loader off. I guess I really ought to check my wheel bolts Real Soon Now...they've never been checked, unless the dealer did it at the 50 hour service. Obviously, no problems yet.