RAM 2500 Hitch

I got my 2500 in December and couldn't find frame brackets from Reese. Curt had them so my trailer guy put those on and connected my Reese slider on. I have the pro series and that slider bar is a pain disconnecting and I'm upgrading Monday to the rp30051 hitch. My problem and pain is the pin box is lippert1716 extended. My hitch is in the last hole so about 2 inches below the bed top - as high as it'll go. But the pin box is so long it gets too close to the side of the bed. And sliding back all but touches the tailgate. I raised the pin box but the part it attaches to in the trailer hangs low still - I wanted to get the trailer level. So now I'm looking for a decent 5th wheel tailgate so I don't ruin mine. My bed is 6'4". I've already kissed the left side of the cab denting the truck good. So if you have a full bed and short pin box all should be fine. I've been told I didn't need a slider, but after I kissed the bed on the other truck I got one. Then my 2014 Ram came with 18" tires raising everything. I'm about tired of adjusting!