Truck too tall for 5th wheel

This may not be the easiest , but on my Dodge 4x4 I changed beds to a Flatbed . It raised the bed height about 4 and a half inches , but no bed sides to worry about . I dropped the hitch down as low as it could go to the flatbed by getting rid of the rails and the hoop side mounts , and mounting the upper hitch part to 4x4 x 3/8" angle , there are flatbed hitches available pre- made also . The hitch dropped down is about 8 " tall, with the flatbed raising the bed ht 4.5" , I ended up lowering the hitch height about 4" inches overall from the regular hitch in the fleetside bed
I have side boards that are 12" tall that are 12" away from the fifth wheel , also use the truck for a overhead camper
I find the flatbed has many uses