That sounds like a good rule of thumb to go by. But this is a BIG truck with 8 "helper or aux." leaves, not counting the 12 upper ones. I have no idea how much weight it takes to compress the bed to the tires. I have not looked good to see if there is actually a "stop" on the rear axel or not.
I do know the front has some kind of material on bottom of the frame for the front to bottom out on.
Thanks, Wayne.


57 GMC LCF 370
55 John Deere 40-W
59 John Deere 430-W
2000 GMC 4x4
56 John Deere 420-W
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