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Legality will be a concern though for most states. A Porsche 911 will handle a back road at 80 MPH just fine and safer than a Semi going 30, but the speed limit is still 35. You can safely drive an overloaded truck at low speeds, even highway sometimes, but if you want to be legal you'll need a F550. Currently they top out at 19500 GVWR. The lightest super duty is 6000# currently, so on an F350 you are looking at with 14000# GVWR has no more than 8000# payload, and honestly, that's being crazy optimistic, more like 6-7000#. Even before you get to the nitty gritty on items and specific truck weight, the water alone pushes you far over. Do quick math first, then when you're close, hone it in.
2016 Reg cab F350 XL DRW base curb is 6800# and with a diesel it's 7581#.
Ok, since I would be pushing the limits too much with 8600 lbs in the bed I'll just mount the water tank on the 14K lb trailer. Maybe rather than buying a used F350 dually 4X4 I might just put a dually rear end and springs under my older 1/2 ton work truck, add some flares and gain some towing stability. The round trip haul is 5 miles empty and 5 miles loaded without any significant hills. The only incline is a bridge going over some train tracks, it's pretty steep and short so I just go slow when I'm on it.
Right now I'm only hauling a 200 gal tank in the bed of an older 1/2 ton 4X4 and I'm sure it is over it's capacity. I would like to have the heavier dually rear end with it's larger brakes when I start pulling the heavier trailer.
A little more thinking makes me realize that I would then also probably have to change the gears in the front differential and that the rear driveshaft might need to me modified because the rear yoke is probably larger. That combined with the cost of the parts, junk yards aren't cheap anymore, would probably make it better to just fine a used 1 ton truck.
The sticker in post #2 only states GVWR, FAWR, and RAWR... No mention of curb weight like the sticker that comes on complete vehicles. Super Duty's come with a sticker on the B pillar now that states how much payload a pickup is rated to handle. This is the sticker the post I replied to was talking about.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.