3.5" kingpin hitch with 2" kingpin trailer

[tcody]

I have a fifth wheel that takes the SAE 3.5" kingpin. Does an adaptor exist to allow you to pull a trailer with the 2" kingpin? Appreciate the help.
thanks

 

[beaubeau]

I take it the 3.5in. 5fth wheel is on a 10ton tractor. When I used to drive one and pull a M172 Low bed, the Pin on the trl was reversible. It can be pulled be 10ton with 3.5 or 5ton with 2 in. 5fth wheel. I don't know what is don to pull any other trls. Good luck, Phil