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This is a bit late but I am about to take apart the back benches from my 2013 E350 to see if they can be made to recline to flat. That would be ideal if the back two benches folded down. One should be able to modify the frame to it pivots. Any luck I'll post some photos
We started out by removing all but the front two seats and putting in 2 cots when towed the 18' boat to Alaska.
The boat is fine for nights on the water, but the van has more head room.
Later I made the second row passenger captains chair recline and went to one cot in the back.
Today beds in the van are not important because we tow a 28' houseboat with all the comforts of home and only spend time in the van while we're moving on the road.