Thanks for the kudos guys. Yes, it did wash it up and treat the tires prior to the photo opp but I only spent about an hour getting it ready.
Couple of things helped - a good coat of real carnuba wax I hand rubbed in a couple of weeks ago and really good back lighting. I used fill flash when I took the pictures and the very tall cedars and hemlocks cast long shadows, hence between the fill flash and the shadows the truck has a very, very wet look to the pictures.
The photos actually came out a little dark, so I increased the exposure before I published them, which created some over exposures. Also on picture number one there is some really bad flare from the fill flash on the rear quarters.
Trust me, my Avalanche is as clean as I can reasonably get it in the Pacific Northwest in February! Again - thanks for the kudos...