I've upset people on here in the past by suggesting that these Jeeps, while awesome in many ways, are a bit anemic...Yeah. New axle gearing just went to the top of the list. Pulling a 5x8 trailer with less than 500# of stuff inside and its like pushing a dead dog uphill.
You've got a 285 crank HP engine in a 4,000lb vehicle with the aerodynamic qualities of a barn. Towing, especially up hill, and more especially over mountain passes requires a fair bit of patience and optimism.