I just bought a 22 Trailhawk as well, like he says if you follow the sequence noted in the manual step by step you should not hear any grinding. 20 step to prep to tow and 16 to remove from tow mode so it is a bit special. I too set up a 12V line from my coach thru a CB to charge for the Jack Brake use which worked great. Far better than a tow dolly, I damaged my struts using a tow dolly on my 09 Corolla.