[gmachinz]

You should insulate the entire interior-behind door panels, above headliner, underneath carpet, against the firewall, back of cab behind the seats...etc. You need to “trap” the cool air inside-and the AC will get cooler and cooler inside. These trucks are poorly insulated from the factory-you cant expect new truck AC temps unless you at least do that. IMO there’s NO reason to use VA in an already equipped AC truck-just overhaul the stock setup and insulate the entire cab.