A friend of mine just picked up a 2014 HDI,60 hours, and in the exact configureation,(even down to the heater)with the same problems, including a bent axle(plowing)in the front,a big gash and a small hole in the tub,from the rubber tracks.This thing was breaking chains,and chewing thru the chain tentioner pads.
Now that it is back together,including a new tub,seems that the chain windup issue was caused by a 2" difference in tire size in the front 2 tires,and now this unit sports brand new track tuners, and runs like a champ.
Im not going to mention what he paid for it,or should I say "stole" it for,but he did it right with the new tub and tuners,and now has an awesome running rig.