Did you end up putting a bed in the back? If not, what about pulling the 1st row of benches, and using middle one instead? Having coolers and what not, between the bench and front seats, is actually really nice, and makes egress from the side door much nicer.
Otherwise, you'd be looking at moving the brackets by drilling new holes, and adding your own backing plates and nuts. If you moved it back ~12", you could mount the front bracket where the rear is, and then only have half as many holes to drill.
Long term, if you want flexible seating, I highly recommend taking a look at ExpoVans (aka MGMetalWorks). They have an L-track floor conversion kit, then you can put seats wherever your want. But you'd have to upgrade the seats too. Which isn't necessarily a bad thing.
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2000 E450 dually V10 wagon
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