Diesel prices are through the roof (2.3€/L) but my backup fuel storage is ripe for rotation. Hopefully the prices have gone down a bit once I finish the last canister.
I always struggled with these 30L canisters and only strained my back and made a mess trying to pour it manually. This 14€ pump sure makes thing easier.
Typical US truck beds are remarkably small.
I recommend looking up some videos about the vehicle. I enjoyed the one from Aging Wheels (on YouTube), but there are countless others. Definitely an interesting project, assuming it can make it past the prototype stage.