I would not shorten one until I looked long and hard and could not find one the right lengthe to start with.

Sounds like you are loking for a model 4100 with a 137" wheelbase, the next longer one is a model 4400 at 161"

There are also 2 tons, model 6100 with a 137" wheelbase, but as you know, a heavyer frame.

The 1 ton model 3800 and the 1.5 ton 4100 do use an alomst identicle frame, but they are different, front bumper mounting and front frame length are the most notable differences, (and perhaps only).

Grigg

•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-