Thank You! That is just the kind of information that I am looking for.

I will test both trucks with the first programmer, but I really think that I will
get separate ones when I know what I want.

The 06 replacement tires are stock sized, Goodyear Wrangler AT/ S LT 265/75 R18. They haave a tad more aggressive tread than the OEM tires, and they sing a bit. I am hoping for a deep snow storm so that I see what they are really good for.

Thanks for the tip on the plugs.

Is it time to change the exhausts? It is worth it?