So I picked up a 10x6 trailer today. I hooked it up and towed it to our farm (can't have a trailer cluttering up my yard!) - so I was cranking the jack to unhitch it and then all of a sudden the rear end lowers.....does the vehicle detect the weight and adjust accordingly? Damn cool if it does. This entire time the truck (is it a truck?) was running - should it be shut down when hitching/unhitching? Even though I have the warranty, with the AHC I don't want to **** anything up. Gracias (in honor of immigration day).