I like how Sherp does this. Tires have 2 automatic valves - you can set the pressure and it will fill the tires with exhaust fumes if it's too low and release t

I like how Sherp does this. Tires have 2 automatic valves - you can set the pressure and it will fill the tires with exhaust fumes if it's too low and release them to atmosphere if it's too high.