Long bed place head supports closest to cab with straight edge closest to cab also. Height, do some math!
B&W is the GOLD standard in non air ride hitches. Simple solid no question if you are hitched US Made.
Base is a bit different than your application.
For some peoples viewing pleasure.
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2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"
"HeavyWeight" B&W RVK3600
2016 MobileSuites 39TKSB3 highly "Elited" In the stable
2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD