WOW !, Neat truck. Yep that's a Heavy Duty Line GMC 750 series, which would be rated as about a 6 1/2 ton truck. GMC called the 700 thru 900 series,trucks "Big Cab" Heavies. The 520-650 series GMC Heavy Duty Trucks used the same cab as the Light, & medium duty trucks, & were "Little Cab" Heavies. Pretty much nothing, cab wise will interchange on one of these with a pickup, except the dome light. That one is a gas burner. If diesel it would have the "Diesel" emblem between the "GMC", & "750" emblems. Looks to have a shop built tow unit on the back. This would basicly be a shop built tow truck, & not a Wrecker. That would be a great truck to have, if not too expensive. You don't see these "Big Cab" Jimmies too often. I hate it, when I'm so politically correct.
