Back in the 80's I worked in Greenville, SC and one my co-workers was living in his full sized van temporarily. He said he had an air conditioner which he would put in the back door of the van when he parked at a RV park. He would plug it in to cool off the van as it was summer at the time. This picture shows some thought on how to use a house air conditioner while being mobile.
Did anyone think of how the picture below looked before making the sign???