I looked at the silverado hybrid. Remember its just a mild hybrid, it doesn't drive under electric power. But they were only available in a couple states. My regular silverado gets 20mpg anyway so it seems like it didn't add much to it for the extra cost. Fuel mileage was something I looked at and most SUV's, even the small ones barely get over 20 with some getting into the mid 20's and then the minivan/cars called SUV's maybe hitting 30 if they are pretty much useless so 20mpg from a v8 4x4 that can seat 6 and has 7' of crumple zone behind it is pretty decent.
I think I've seen that avalanche on some of the HAM forums with all its antennae on top. Do you have problems with those Blitz gas cans leaking when your filling, mine does.