There is this LCO with a 1 ton Dodge and they leave the truck running all the time when they mow across from my shop. They do a commercial business park that takes the maybe 10 min. max. I just don't get it though because isn't it bad to let the engine sit like that and idle? Semi's can do it because they can idle the truck at higher RPM's right? I was looking at a Chevy the other day and I think you can get that option now, something about a high idle switch, or is that something totally different?