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Ford didn't officially have a "5/8 ton" or "Heavy half" setup like GM did, but they did have a high payload F-150 in this body style.
It has a set of overload springs on top of the main spring packs with a set of brackets on the frame that the overload only touches after enough load has been put on the main springs.
The GVWR on these trucks was around 6100 lbs in a regular cab long bed 4x2 setup.
In the eighties, the sales brochure shows a few variations on on some models, two diff weight capacities...you'd have to see it to understand me. I know mine is the heavier of two.
well after lookin around i found out that my trucks vin code e stands for gvw 6000-7000lbs this bing the heavy of all f150s but also a what franklin2 called a light duty f-250 my buddy is a gm fan..... he will learn one day after i pull him out of a few more mud holes well thxs for the info guys
IIRC the 6050 GVW rating of the F150 excluded it from certain regulation and let it run on unleaded gas as opposed to the F100 (< 6,000 GVW) that had to run it. That made it a "heavy duty half ton".
Never did figure out a justification for the "light duty three quarter ton" ... F250LD except in the late nineties when they didn't even call it that and it had a heavier frame, 7700 GVW, 3/4T 5.4, 3/4T tranny and 3.73 gears.