We bought a 2002 Ford F350 to pull our fifth wheel. There are two rails and a spot for a gooseneck in the bed. It’s a full size bed. I know nothing about fifth wheel hitches, but I’m trying to learn. How do I know what hitch will fit the rails? Is it one size fits all? What type of hitch would you recommend? I’ve seen hitches on craigslist but I’m worried that as newbies we will buy the wrong thing. n the other hand, I hate to buy new if we can save a few hundred bucks. Any help is appreciated.