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I wouldn't fall for any undercoat gimmicks. For the frame, underbody, etc. you can use a rubberized undercoating. These are available in everything from sprayable undercoat (that requires an undercoat wand gun), to aerosols. I would recommend the sprayable kind for 2 obvious reasons; 1: sprayable is MUCH more durable and 2:Spray bombing the underside of an entire truck would take forever and COST A FORTUNE.
I'm from Iowa and work in a body shop and I can tell you that none of them are permanent, but if you use one, definately go with the sprayable.
As far as the oil pan goes, just try to keep it rinsed off in the winter.