The engine increases the bumper and the winch... Wouldn't the wind be too big?
The wind resistance is very small, it will increase the weight of the car, after all the winch is very heavy and the winch can be built in and out.
If you want to make it easy, you can make it out of the way, and it's easy to disassemble, so you don't have to take it with you when you go cross-country. I'm an electric capstan
Pneumatic and electric are the same, just understand the source, if the air can that will be more energy efficient, but the key is you go to a pneumatic motor, so big power transmission is not a problem, use electric winch is ok, I have here ready.
