Anyone with experience using a gooseneck?

I never thought to look at the gooseneck ball mount on the new to me 06 Ram 3500 I bought about a month ago for a TV. Well, to my surprise I found the previous owner must have pulled the box off and then just welded a 1" x 12" plate across the top of the frame for the ball and safety chain loops. Problem is I may not be able to put the frame mount for the 5th wheel rails in... I am waiting for a Reese 5th Wheel Quick Outboard Frame mount kit to arrive and try. If it doesn't fit around this plate, it looks like I'm going to have to change the trailer to a goose neck hitch. How big of P.I.A. is it to use? Surely they can't be that difficult, but I really want to be hooking and unhooking the thing to be as effortless as possible. A big part of the reason I bought what I did instead of a Class A motorhome was so I would be able to use the pickup at our destinations...