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Hybrid drive concept

Concept for a hybrid drive truck

Obviously gathering fuel is survival is a chore, but parking a bearing powered truck is also a chore.

Therefore the hybrid truck.

How does it work:
Normally when having a stack of pipes and bearings the bearing will do nothing unless the gas engines also provides power, this is because the gas engine only brakes when nowbody is in the controlling seat. This is an issue, since it means you can't run on on controller power when in the gas engine seat. Adding a second seat would solve this, however it's expensive and causes issues with the steering that can't be connected to two seats.

So to "brake" the gas engine i've added some pistons that move a woodblock in the way of the axle pins (connected to the gas powered axle sections.

Schematic:
[Vehicle chassis]
[Gas engine powered bearing]
[T shaped pipe piece] [corner pipe piece to hit the brake]
[controller powered bearing]
[straight pipe piece]
[controller powered bearing]
[wheel]

This makes the minimum width of a vehicle with this propulsion setup on only the rear wheels equal to 5 blocks between the wheels.

Front wheels:
In the concept vehicle the hybrid drive is not functional on the fornt wheels, and would be bulky to be implemented. However it still works as a boost when the gas engine is used, and since controllers don't use batteries or fuel it doesn't really matter. It is likely best to only power the front wheels with a gas engine so all wheel drive is available when neccessary.

Survival recommendations:
After building it and thinking about it for a while i'd recommend a set up with at most 2 rear wheels on each side, since those can be powered by a single max level controller.

That would make the minimum cost of this system for the rear wheels 6 bearings, 1 max level controller and one gas engine, 4 pipe pieces, 1 piston, 6 blocks, and 1 or 2 switch(es) (depends on whether you want boost mode).
Of which the gas engine en 2 of the bearings are likely already accounted for in your vehicle design.