Wow, what kind of hitch and air pin are you looking at??
I have a SuperGlide and Fifth Airborne pinbox, and have maybe $2500 into both of them.
On the other hand, the air hitch will stay with your tuck and can tow a bunch of different fivers, the pinbox is pretty much exclusive to the frame it works on. (mine was a Lippert 1621HD)
Steve and Vicki
2011 Dodge 3500 CTD Outdoorsman
2013 Columbus 320RS-ITS HERE!!