How Big Is The Disc

A while back I installed an under bed goose neck hitch in my (not new anymore) truck I bought last year.  I also picked up a fifth wheel companion hitch that drops into the "receiver" instead of the goose neck ball.  After assembling, adjusting, and test installing the fifth wheel hitch I left it in the truck.  Its in the way, and the ball takes up valuable space in the under seat storage compartment when it could just be upside down in the receiver instead.  I can loose the tension bolt, pull back the cross pin and lift out the fifth wheel hitch by hand, but I don't want to.  Its heavy and as my regular work outs remind me I am at the age when I am just trying to maintain strength, and probably not going to get stronger.
I was thinking about making a lifting eye for the fifth wheel.  It doesn't have to be super strong.  Just stronger than me.  Then I could use a chain, cable, or just a hook to lift the hitch out with the tractor.
Originally I was thinking jib crane near the front of the shop, but after picking up a shipping container, and moving a lot of things out of the shop I realized shop space is to valuable to store something that will only get used occasionally.  It needs to go in one of the containers, or even just outside on a pallet or rack.
I might still want a jib crane in the shop...
Anyway, what diameter is the disc on a fifth wheel trailer?  Not the horseshoe int he back of the truck.  The disc that slides into it.  The fifth wheel I'll need to move a few times yet is 60 miles away, so I can't just walk outside and measure it.
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Bob La Londe
CNC Molds N Stuff
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