I just bought my first 5th wheel hitch, used. It didn't come with any pins to attach it to the rails. The pin used to attach a bumper hitch to the reciver looks like they are the same as the 5th wheel pins. Are they the same?

 

Not sure, but it doesn't matter. You'll need 4 of them.

http://www.etrailer.com/pc-5WAcc~6014.htm

Here's a set for $16

 

Most any trailer supply has them. Drill the pin hole out on two of them and put a padlock in them - - slow down someone who decides they like the looks of your hitch.
Bob

 

what type of hitch.