"most folks use something like the pricey DynaMat, or the foil covered bubble pak insulation or stuff from a builders supply like Peel N Seal"
Please don't use "peel and Seal" type home building products in your truck. IF, big If here, your truck were to catch fire, you would not die from burning, you be dead from the noxious fumes from the Peel and Seal. There are less expensive alternatives to Dynamat that ARE meant for automotive applications. Do some internet research on the subject and you shall become enlightened. Saving a buck on your ride may make for an expensive and untimely expenditure on a coffin.
http://www.sounddeadenershowdown.com/cgi-bin/index.cgiRaammat is a quality alternative with a budget price. I bought a roll for my truck and still have a bunch left after doing the whole truck.
