It appears as if those scissor arms are solid steel, if so that mechanism and steel deck is seriously heavy before putting anything on it.

I can't make out what is on the door, wonder what it was used for. I've seen similar at the airport but nothing this heavy. The airport idea could explain the lack of outriggers, not so necessary on dead flat concrete.

•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-