I have a Marathon aluminum deck with expandable sides and 2 piece sliding ramp on a stock F350 4x4 SB. It's a piece of cake to load and superclamps are a great addition. I built a sled for under the deck from a piece of 1/2" plywood, added some 3/4" x 1" strips of plywood with holes down both sides of the plywood. We load tons of grear, toolboxes etc. bunjee them to the sides of the sled and push/pull it in and out of the box. Lock the tailgate and away you go. I wouldn't consider an enclosed 4 place, not where we drive and park! 
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