Tow Vehicle for 14,300 lbs GVWR toy hauler fifth wheel

124,000 miles is just good and broke in IF it's been well maintained and has not had a tuner installed that added too much power. If its had a tuner/chip that added 250 HP most of those miles, and been used hard, the transmission and engine components could have issues sooner rather than later. That engine should get 500,000+ if well maintained and stock (or close to stock) power levels. Bottom line - do the research on this specific truck as much as possible.