You have a valid point Jerry. The battery trailing car produced by Aristocraft (for the 27Mhz. TE and presumably equally good for the 2.4GHz. REVO) was a stock car for the very reason you suggest i.e. ventilation.Everyone seems to run whatever they like for a trailing car
I typically use a stock car, as I thought the ventilation was good for any heat that may be generated by the ESC board, but maybe that is just not an issue..