He would need to convert all his vehicles to liquid fuel. Then build tanker trucks. And one or two tow trucks also. His vehicles are a little smaller than they need to be. I think double the sizes, maybe even triple, and they would be perfect.
Now that would be pretty cool! Put 5 or 6hp B&S engines in them with built-in starters, computer controllers, lights, and back-up beepers.
Instead of having tanker trucks just have fuel station for them to pull into and refuel automatically.