You do realize that woodgas was used extensively in Britain during WWII, and our own government has a publication on doing exactly that, to run a tractor or a truck?
You can look on Google Books to get the US publication that shows you how to build one. Those Google Books are free.
/johnny
It might be worth the time for a tractor but I can’t see wasting the time on a truck when a horse and wagon are a reliable alternative.
I know someone that can run a generator with a gasifier, that can run his whole house. And it runs his truck.