Advice For Moving

Hi everyone, I am moving across the US next month and am trying to figure out the best way to move everything. I’ll be bringing my acoustic guitar, an electric guitar, a bass, as well as my guitar and bass amps. I have a moving truck hired to take everything big, but will also be renting a small uhaul trailer to tow behind my car (the drive will be about 3-4 days) My end destination is Arizona, and it will be July when I move so it will presumably be pretty hot on the trip. I don’t believe the moving truck has any sort of temperature control. Does anyone have any recommendations about the best way to move everything? Is it safe to put anything in the moving truck, or is it a better bet to bring them in the small trailer with me (or any other alternatives)?