Seat/Bed
I found my rear bed on Craigs List. It had never been installed. i got it for $350. We now have it in our 2008 E-150.
In the photo you can see the wheelchair lift at left. I installed an onboard air tank below, and later added a 3rd air connector just behind the lift. Its ideal for blowing out the van and keeping wheelchair tires inflated.
The bed is installed at or very near where the original 3rd seat installed. I originally bolted directly to the floor. The problem with this came when we created the bed you had to remove quite a bit of stuff in the back. So I removed the bed and added some 2x2" sq tubing to lift the seat a bit. This made for a nice compartment underneath and allows us to leave some things behind the bed. The switch to run bed is on the wheelchair lift and runs of the aux battery. The seat belts tend to get lost when you raise the bed to a couch so its good to have switch near the bed so you can keep'em in order with one hand while operating. Raising the seat did reduce the view out rear view mirror a bit I still enough.
The bed is 5'8"-sorta. For comfort we tend to get the bootie right in the middle section. So our pillows dont line up. I'm 5'9" and my feet dangle by a good 6". As it happens by lifting the bed, it also is at same height as the wheelchair, so I just turn it around and rest the ankles on the seat cushion. Karla is 5'-1" and fits perfect.
I left the 2nd row seat belts in. I added some removable tie-down clamps on the floor that can quick connect to the seatbelt to secure cargo.