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"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."
My only concern would be if the Propane gas tank mount would be strong enough to hold up against a crash with 15mph against a wall?
If you can expect the bolts to break, I would reconfigure the construction.