I'm moving and I don't fully trust the moving company so I want to keep my guitars with me. Problem is I am going to TX so it is hot hot hot and will take 4 days. I plan on putting them in the bed of the truck that has a locking tonneau cover. One is in a case the other a gig-bag. Should I be concerned about damage during the trip? Strings are loose but google tells me during hot weather that might not be enough. Thanks in advance.