Are you running a ball coupler or a kingpin on the trailer that needs a 5th. wheel? Most ball coupler tubes are adjustable vertically to accommodate different ball heights in the bed.
Jerry
Yes the ball coupler tube is adjustable for bed heights, but I'm not sure if the jack/landing gear on my trailer has enough up/down movement in it to clear the bed floor when backing under the trailer and then drop in a bed hole all the way to frame height, where i'm assuming the ball mount would need to be located, like it is on my 99 Ford.
