I think the way to go is an existing 4 door pickup. I think you will need to go with a full size to meet the 4x8 requirement. Smaller trucks will hold a 4 ft wide sheet, above the wheel wells. Of course, if the batteries are in the bed, you could have a bed floor above the wheel wells, with the batteries beneath this floor.
I would keep the existing front and rear suspension and drive shafts. Keep the live axle. It is already there and better at carrying loads. You could put the motor at the input of the trans or maybe even loose the tranny and have the motor power the transfer case directly. I think keeping the trans is a good idea as it will allow different ratios depending on payload.
Why a boxer engine? I suppose it would allow for the batteries to be mounted above it.
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