Oh...to answer your brake pads issue. You'll love this part.
Brake pads are interchangable between Civilian and Military.
I do recommend getting the Hawk Super Duty Brake Pads.
http://www.bluehummer.com has them.
Waterproofing - Civilian trucks only are water rated to 30 inches. I've had splash up to the windshield and have had it sitting in water up to the top of the bottom seat cushions, which is about 38-40" of water. As long as the wiring or the engine computer (same level as the AC controls behind the dash) do not get wet and short out, or you don't ingest water (get a snorkel or make one cheap!), it will run while sitting in the water.
Military ones can withstand more water, and with the deep water fording kit and the proper ventilation, you can go underwater (literally) with the military truck.