I too have used the method Wes mentioned many times and it worked wonderfully. Everyone made it from Texas to Arizona and then from Arizona back to Texas. I just also took a spray bottle full of H20 to mist down any that needed it because it was super hot when we moved.

Oh and by the way... Go with Penske. They take WAY better care of their trucks than UHaul. My dad does a lot of work with Penske and their policy is to keep a truck for only 3 years. UHaul usually keeps their's till they die. There are also tons of reviews online with UHaul customers talking about how the trucks died, breaks quit, etc. I'll see if I can find the one's we found for ya.