12 volt All-Season heater and fan. Plugs into cigarette lighter. Road-Pro truck heater and fan. Mounts right onto your dash and will keep you warm in the winter and cool in the summer. This would be great to have if you ever find yourself without a heater or air conditioner and it is fully portable in case you occasionally drive different trucks.
This would also come in handy if you were stranded or sleeping and didn't want to run your truck to conserve on fuel. Every trucker should have one.
These sell for about $39.00 in truck stops. You could get a great deal here on one of them.