My company makes violins, and we ship all around the country. Though we've never had damage occur due to cold, we have definitely damaged them in the heat. Whole containers of instruments sometimes. The same would apply to drums.



You have glue that softens or even liquifies in that kind of heat depending on the type. You may have varnish, which depending on the type will do all kinds of ugly things in the heat. Pit the two against the wood, which wants to move like mad in that kind of heat, and you have a recipe for disaster. Expanding wood and softened glue = delamination. Plastic wrap will wrinkle, haze over, and come unglued.



Putting a drum set in a heated car is the same as saying "OK, I am going to destroy my drums now". I would rent a kit for a distant gig before I would risk that. There must be another way for you to go.