The title may be confusing or even misleading. The guys talk about a recent trailer purchase Eric made for the business. It's not anything special but it should help with the workflow. Here's to hopin...
We had ones like that in the oilfield. Basically, a diesel engine spins an agitator that heats up hydraulic oil, then a fan blows the air through a heat exchanger.
Functions under the same principle as an automatic transmission cooler for cars, but channeling the heat rather than dissipating.