Other than alignment issues ( which I never had) the d50 ttb is a strong axle.
I've been extremely impressed with mine. I've broken the tube on drivers side, but after a piece of 3/8 plate formed around the knuckle and pumpkin I doubt it will ever break again.
I snapped that a mile down a lake road, in a blizzard with a v-plow on the front and chains all way around and a yard of sand in back. I dumped the plow and (no kidding) drove the truck probably a little over 1/4 mile do my other truck and trailer could get to it.
Let's just say my most badass truck has a ttb d50 and I'm not scared one bit that it will let me down. Go to my YouTube account and see how bad I thrash my mud truck with a ttb d50. Like I said, other than alignment issues it's a great axle.