i've got a 97 Z-71 and a slightly modified( or hacked up)16ft utillity trailer that has made a many project get'n trips,the last trip was just over 600 miles(round trip)and was the first time I had any trouble.I would like to upgrade to a newer 3/4ton like J Lucas but I have a bad habbit of spending the new truck fund on old stuff,example,last trip the typical intake leak on Z-71'S became a bad leak,especially pull'n a loaded trailer,run hot if not pay'n attn.,that was in early Dec. the truck still leaks but I just got two boxes of front end parts for a 49sedan project.This is'nt a hobby,this is a disease!!!!