Don't idle your loud diesel at 5am for so long!!

At the golden nugget cg in anchorage whil walking the dogs early, there were several diesals happily making noise and fumes for about fourty minutes. I asked an owner why and the reply was it took that much time to charge the air tank. Now if the high dollar mh mfg wanted to support the green agenda, you think they would simply put in a larger air comp or run it off the engin battery