To lengthen the frame was a working step, already done by Dodge to convert the base of a WC-51 into a chassis for the WC-54 ambulance and radio car.
The frame consists of pressed steel channel section side rails reinforced by heavy cross members and angle braces. It has a longer 121-inch wheelbase with the addition of a heavy reinforcing plate riveted to the outside of each frame rail.
The Soviets did the same but extended it to 148 inch wheelbase. Easy job in theory.
sources
pic #1 - world-war-2.wikia.com
pic #2 - pinodesign.nl
pic #3 - minitracks.forumpersos.com
pic #4 - war department technical manualAttach file:
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