What kind of towing are you doing? I use the wife's 95 Yukon 4wd to drag just about anything and haven't had much trouble. I also had a 93 Burb but I like the Yukon over the Burb as far as dragging trailers.
Although the Burb should do the job. It looks like the front is still half ton. You might want to look at getting the larger 3/4 ton front to match the rear for better braking.
Just my 2 cents. Lots of decent looking trucks there in that yard as well
Paul