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I have an 82 F-150 S'cab 4x4 w/ a 6450 GVW. Trucks weighs ~5,000 full of fuel w/ me in the cab do I can carry roughly 1,450lbs legally.
Best way is to run your truck over a scale then subtract that weight from your GVWR. That's on a tag on the drivers side door pillar.
The GCWR is the GVWR + towing capacity, for an early 80's F-150 that's ~6,000lbs. That means the truck w/ trailer can't exceed 12,450lbs.
Unless you register the rig commercially and tag it higher. Mine is tagged for 13,000lbs. Meaning the legal weight of the truck w/ trailer is 13,000lbs. In theory you can tag a truck up to Idaho's maximum of 150,000lbs and throw an IFTA sticker on the door.
While that's legal on paper a DOT cop can defer to the manufacturers plate.
If you're towing a trailer in excess of 10,000lbs GVW (even behind a F-150) you need a Class A CDL.
I just went through an 18 month DOT compliance check w/ my 82 F-150 so if you need help ask. I'll try to spare you the reaming I recieved.
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