I have actually thought about doing the same thing with my 56 1.5 ton GMC I think it is a great idea.
I was thinking it would be great to use the big truck front fenders for all the clearance for a set of 44” swampers as far as the rear fenders I was thinking if a guy were to get 4 good rear fenders and cut one set into fourths with two straight lines one vertical and on horizontal you could use the other set to make filler panels and stretch the first set. Essentially make you own big truck rear fenders just stretch them the same as GM stretched the fronts.
I also have a 71 Chevy 1 ton dulie that I have thought about making a dulie pick-up box for buy using the fenders off of a step side and grafting part of them to a wide box as dulies were all cab and chassis and they had no dulie pick-ups


The difference between men and boys is the price of their toys.
Grant from Roy, Washington
1956 6100 Chevy Dump Truck in the Gallery
1964 GMC Drump Truck in the Gallery
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