i am looking in buying a new toyhauler soon and want a 5th wheel @35' for the room inside. and would like to have the room in the bed to haul stuff when i park the trailer. so i want to convert the king pin to a goose neck. and install a pop up ball in the truck. i have looked at some of the past posts abot the adapter and it seems like it is not the best thing for the trailer, but it works. i really want the room in the bed with out the rails of the 5th wheel in the way. the trailers i am looking at are 9200 lbs dry and with water, food, chlothes, bikes i think i will be around 12500lbs max. all of this in a 2500 megacab 4x4 with a 3" lift. any thoughtsor suggstions would be helpful since i will be purchsasing in the near future. thanks