Sound deadening in Arizona heat

Just bought my taco a month ago, been doing little things to it but nothing big yet. Once I get my tax return I want to start fixing up the sound system. I want to start with sound deadening the doors, back of the cab and possibly at a later time the floor and roof. Then a stereo and speakers, not sure which of the 2 I want to do first.

I know sound deadening will cost +/- 200 bucks, but my buddy who is my coworker and has been working as a body tech longer than me says that in the Arizona heat it wont hold and will just collapse to the bottom of the door. Now I havent looked into the heat issue too much, but is this right where temps can reach 115 or more during summer?

 

The surface temperature of a door can definitely go above 115, especially with a darker color paint job.

 

youll be fine. myself and a few others have done sound deadening ourselves. currently mine is the back wall, including ensolite foam on top. Another member deadened his entire cab minus the roof. doors, back wall, floor, under the dash, is all done.