most people go for a drive on the freeway ( interstate most places ) and see in the slow lane lots of RV's and Semi Trucks. then don't think about what they do when they stop. to keep it simple, let's say it's cold. to keep the RV's warm it's either turn on generator or PLUG IN at a park to warm RV all night. generators are impractical in a Semi Truck. so it's either idle engine or get cold. solution is to have OUTLETS everywhere Semi Trucks stop. to make this a whole lot easier would be to have inexpensive electricity in all 48 states. Have A Nice Day!