They probably just refused to mess with them because they really are a a pain to change. The lock ring is actually pretty dang hard to pry out of there, then you got to get the old tube out of there (its usually pretty darn messy and slippering inside the tire too), put the new one in, then put it all back together and pry the snap ring back in place. Usually you end up destroying the snap-ring, and i doubt most modern truck shops would even stock the ring for your wheels, or even the tires or tube for that matter. Trucks have been running solid rims for a LONG time now, not many shops would even know how to change a split rim.
