Interesting story on the TV news...
Apparently owners of older Nissan Leafs (Leaves?) are getting screwed by Nissan. The batteries are coming to end of life and Nissan doesn't have replacements. Nissan suggests that the owners buy new cars. They say that the batteries on the new cars will last almost indefinitely.
It seems to me that soon you will be able to pick up a Nissan Leaf in good shape for next to nothing. Salvage the motor and electronics. Buy new batteries and you should have all you need to convert your truck to electric.