Hey Rock. Since different truck manufacturers bed floor sit at different heights, you may want to specify your truck. Someone with same setup may be able to give you a better idea. Or maybe some can give u an estimate from the ground to the top of their hitch.
2017 JayFlight 28BHBE
2014 JayFlight Swift 264BH (Sold)
2007 GMC 2500 Sierra Classic Crew Cab LBZ Duramax / 6spd Allison