Sliding 5th wheels?

[Espeefan]

Diesel Chopper, that looks like a nice set-up! Thise tires are sweet!

Keep the ideas coming guys. I'm still leaning torward making up a set of rails that bolt to the chassis, with a keyway milled into them and a few holes to position the 5th wheel fore and aft. Then mounting the 5th wheel onto a plate that will fit into the keyway. Simple, all manual, and kind of basic, but I think it will work well.