Friend of mine hauls apples with a Dodge tandem axle and a swapped 378 V6 with a 13 speed Roadranger.
Last season he said mileage was 2-3 MPG average for loaded to the plant and empty to the orchard.
I'll have to ask the weight again, but it was as much or a little more than a tandem axle truck can legally haul, it's got a pretty long flat bed and they stack the bins.

A 378 will haul most anything with the right gears and plenty of fuel....


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-