I have always stated that there are two type of people who pull with a short bed truck and pull a 5er! Those that have hit the cab and those that will!
I have a 2008 Ram Mega Cab with the 6.5' box using a manual sliding hitch, this has been used in two different short bed trucks. I have pulled three different 5er's, all with extended kin pin boxes and two of them have had the rounded or 88 DEG's corners on them. If I did not manually extended the slider hitch when turning really sharp to get into a narrow camp ground site or into my driveway I will hit the cab of the truck with the trailer. In normal day to day driving on highways and city streets I do not need to extend the hitch and I can pull the 5er with no issues. It is only in real tight turning situations that the hitch needs to be extended.
My first trailer was a 2006 Ameri-Camp with an extended pin box this had a radius front end but not enough clearance with the cab. My next trailer was a 2010 318SAB Cougar with the 88 DEG corners, this two would hit the corner of the cab in a really tight turn. Our current trailer a 2016 34RL Cedar Creek will hit also in a very sharp turn.
2016 34RL CC; 2008 Ram Mega Cab 2500HD, 6.7L, 68RFE 6 speed, 4X4, Smarty S67