I figure about 4' less when hitched. My truck is 22' OAL and my 5er is 28' OAL for 50' total. Minus the 4' for the 5er/truck overhang factor and I'm at 46'. I can hang my rear over the backup curb about 3-4' so that gets me down to 42' or so.
42' is my minimum length that I look for when booking sites. It's worked out well so far.
Not all CG's measure the drive length the same. We camp at one CG and our favorite spot is listed at 30'. I have plenty of room with a lot leftover to park their. I still can't figure out why they think a 50+' long spot is 30'.
From the jaws on my 5th hitch to the face of the rear bumper is 51". should be close to that for most trucks using a standard non slide 5th hitch.
