dayle1 is a little off on his discussion of CA (cab to axle distance). For chassis cab trucks, he's right on. The industry standard for the shortest chassis cab trucks is CA of 60", regardless of truck brand. But pickups are different. For 2009 F-350 DRW with 8' bed, CA is 56.3". I'm pretty sure that 56.3" CA hasn't changed since at least the '99 model year, so his 2015 should also be 56.3". (GM and Ram might be an inch or so different).
Some 5er hitch install instructions say to mount the hitch in the bed so the center of the kingpin will be 4" in front of the center of the rear axle. So if your installer follows those instructions, your kingpin will be 52.3" behind the cab wall.
52.3 times two = 104.6". The widest RV 5ers are 104" wide, so even those wider 5ers should (barely) miss the cab with the hitch mounted 4" in front of the rear axle when you jacknife the 5er into a 90° turn. Just a hair more than 90° and you could have cab to trailer contact.
But most 5ers are 96" wide, so if your trailer width is 96", you'll have several degrees of turning left when you back into a 90° turn.
And some hitch install kits won't let you mount the hitch 4" in front of the rear axle. On my 2012 F-150 SuperCrew with 6.5' bed, the custom install kit for my Reese 5er hitch had to be mounted so the center of the hitch was about 1" in front of the center of the rear axle. Handling is fine, but I'd prefer a bit more forward to shift more hitch weight to the front axle of the tow vehicle.
After you have the hitch installed and the 5er tied on, go to a big empty parking lot with a helper, and slowly back the 5er into a jackknife. Even with a 104" wide 5er, you should be able to achieve a full 90° jackknife. But have your helper scream bloody murder if you are about to have a CRUNCH!
Play with backing unto a jackknife until you are comfortable with knowing where are the limits for your rig.