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We removed a chimney from our house and rented a gooseneck dump trailer to haul away all the block, brick and mortar. I started to worry that we would run out of room (the trailer had 4' sides, 14' bed). But we managed to get it all to fit. We all took turns guessing how much weight was in the trailer, my guess was 12k. We had a few hills to climb (couldn't get more than 6 PSI), and I tried to stay off the 65 MPH highway so as not to hold up traffic. The truck seemed happy around 58-60 MPH. We had to unload some block off the top so the trailer would actually dump. I asked the attendant how much we dumped (no charge for concrete, so they don't normally give a load ticket, but they weigh everything.) His answer? 11,900 pounds. The trailer has a 12k max, so that wasn't an issue. But, the manufacturer lists a 4300 pound empty weight, so we were pulling roughly 16,200 and the GCVW exceeded 22,000. Oops!
Typical Ford, though; didn't complain, and handled it quite well, although it reaffirmed the need for new rear shocks, and air springs are in it's near future before towing our 34' enclosed gooseneck across the country.
Your trucks rating is more for insurance and licensing proposes than any thing. the obs style will handle more than there rated for, you just wont go as fast. I've seen two 350 super duties with factory springs not much heavier than my 95 f150.
If you go by the sticker in the door jamb, i overload mine about once a week. Hell the lightest thing i haul around regularly is the hoe and its 17.4, tellehandler is 18.7, and 20k when i haul hay. Thats not counting the 5+ trailer- 28' PJ