You have another thread where you seem to be concerned about the ability of the GMC to climb and descend the mountain grades. If that is the case, definitely take the towed, and disconnect it and have your wife drive it on those big grades. You can use it to reduce the weight in the rig (your wife, the kids, some of the gear in the towed on the grades) and it will be a life saver should the old girl (the RV, not the wife) have a problem. As a general observation, I have always found a towed to be a near necessity. It allows you to tour, run errands and go places the rig can't go all without the time and effort of breaking camp.
