Another (albeit less then popular) option is to do what Hotrod Lincoln suggests and just run the current RH5 inner duals on the rear. As long as they are holding air and you are rolling empty, you should be fine. If anything happens and they let loose, the wheel will blow inward vice outward toward other cars (like the outer dual will do). Then once you are back you can air down, demount, and replace the rears from your home.
Honest question, do you have the route back mapped out? Are you running state routes and highways or interstates? Because you may be surprised at the max speed, especially for a truck that has sat that long and is assumed to be worn out.
