tow n slow,
Since you have the truck already, you need to go get an actual weight with at least full tank of fuel and all passengers that will travel. Get both axle weights (easy to do on a Cat scale) and you will know what the rear axle is carrying already. Subtract that from the RAWR--(rear axle weight rating) to see what is left for pin weight. No matter what that number is, you should NOT go over the weight capacity of the 2 rear tires--normally somewhere around 7500. Then you will have to have a hitch (+/- 200) so take that off the 7500, and there you have the available weight for the fifth wheel pin to put on the truck.
Normally, the RAWR will be somewhat less than 7500. Your decision to go over the truck rating but should not go over the tire ratings.
You can take a look at 'ultra-light' fifth wheels that might help you out, but keep in mind the pin weight of any fiver will be in the range of 20%+ of the GVWR.
Not a great situation to be in.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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