Are we still beating the dead horse?
If so, for me, the horse = a problem of mis-understanding. There's good cheap China shit and there's bad cheap China shit, obviously we're not talking about amplifiers that are too good to be true, ie 5000w for $199.
On topic again, one more thing we used to do was cover the cars with some reflective foil when waiting in line to get metered. That way the car was still cold inside without using the A/C and the battery. And it was nice to have a cool spot when it's ass-degrees outside.