Gooseneck fifth wheel and a flat bed. Help!

Hello, I'm a little green on this so please have patience with me. I have an 1985 Chevrolet K20 that has been converted to a 1 ton truck with single rears. It has a flat bed and is set up for a gooseneck which I use quite often. We have a pop up camper now and my wife is wanting to upgrade to a fifth wheel. I have done enough research to know that there is conversions for this as my hitch ball sits below bed level. This is a gas truck with a pretty heathy 350 CID engine that I built mildly to tow with. With that being said this is not a Cummins or powerstroke. I am looking for someone that has some knowledge of these trucks and has a decent wealth of knowledge as to what these trucks are capable of camper wise. By the way, it may pull it but I also want to stop it when the time comes. Thanks and god bless.