nice truck, the pics worked out for me. i use mozilla firefox and the truck pictures came out just fine for me. well for sealants, the four star ultimate paint protection(UPP) is very good. i hear that it last long and it looks good on both dark and lighter cars.
i have no experience with the poorboys EX-P yet ive heard good news about it too. for carnauba wax, which goes on top of the sealant, i just bought s100 wax and though i havent tried it yet, i hear many good news about it from word of mouth as well as here in the forums.
another good carnauba wax is poorboys natty's. you might wanna give poorboys' nattys a try on your dad's truck and see how it comes out. overall both s100 or even the poorboys nattys will give the truck an awesome look.
these carnauba waxes i mentioned above are paste wax and not the liquid carnauba wax. ive heard that paste carnaubax wax is better than liquid carnauba wax because its more durable. people correct me if im wrong here.