ning
Elite Member
The payload rating is for safe full use of the truck, which means that at the rating it will safely go at speed, turn, stop... presumably also will be safe going over reasonable bumps etc.
Wow. Talk about conservative... You were at zero risk. When I was clearing my lot, I was working with a friend to block, haul and split the oak firewood (we only hauled the oak as valuable, junk trees just got burned in piles). I had my F250 with 8' bed and I had added ~18" sides to protect the rear window and add a bit more capacity. My friend and I had divided up the work so I would go to the land, block up oak into 16" length, then load the rounds in my truck and drive to his place and unload, where we had the splitter setup and he would split and stack.
I would fill the truck up but certainly not 100% to the rim. Never seemed to sag all that much. One day I decided to go to the scales out of curiosity. With a rated payload of somewhere around 1800-1900 lbs, I was hauling over 4000 lbs at a time.I cut back a bit after finding that out but frankly you could not tell that it was causing any issues at all. I made a couple dozen of those runs that summer.
Now if you're going a ton over payload rating, but you're driving carefully, slowly, really slow on bumpy roads to reduce shock loads... you're probably actually staying within the spirit of the specifications.
When I look at the suspension of a truck like M1078 (LMTV; and its trailer units) and then see the payload & towing capacities, it's clear that those capacities were written with bad/off road travel in mind, which places considerably greater stresses on everything, so they whittle the numbers down to give it a chance at survival. Keep that on pavement and it's got to be worth at least twice its stated rating.