Petrel: As you may know, the Super C is generally built on a Commercial Truck chassis, so it should go a long way without too many problems. Consider buying a "roadside emergency" plan from Good Sam or Coach-Net for the "life boat" piece of mind. If you take a toad, you will need to protect it from flying stones from the RV and you will put over 10,000 miles on your tires, and other components for limited use given your time constraints and the need to keep moving. A 37 foot RV will not be a problem in most areas, unless you really go off the grid.
Keep in mind that the so-called largest RV show in the country will be held in Hershey PA in mid-September. Usually there are huge numbers of rigs there to look at, including Super Cs.
Consider reviewing the messages in Roll Call Alaska 2013, 2014, and 2015 topics listed here in this section if you haven't yet. Tons of good information that helped us greatly in planning our trip.