I have the same model and it works as advertised. I don't charge it for 8 hours as the car battery will do it for me when plugged-in and operating. I need to change the sensitivity and have never changed the force mode since setting it years ago.
I suggest you call the good folks at Blue Ox as they can help you better than I.
Tom Dameron
2016 Renegade Verona, Freightliner M2, 2009 Honda CRV, 2015 Jeep Grand Cherokee