Back in the 40's, & 50's, you would see Holmes Light Duty 460's, & 490's, on the '47-'54 4100 series trucks, Holmes 515, & 525 Medium Duty Wreckers, on the 4400, & 6400 trucks, & sometimes Dealerships, that did alot of Big Truck Sales, & Service would order Heavy Duty Holmes W35, & Holmes W45 units, on their 6400, & up trucks. You saw alot of W35's, & W45's, installed on the Heavier GMC Trucks also.
