I just picked up my new 5th wheel today and the hitch in the truck I bought is a Reese with a slide system. When I got it home I used the slide feature to slide the hitch back so that I could make a tight turn. When I moved the lever to the maneuver setting and pulled the truck ahead it slid the hitch back ok but when I backed up it slid forward again. I tried it again pulling the 5th wheel a few feet to put weight on the hitch and it still didn't catch in fact it slid forward when I stopped. Am I doing something wrong or is the hitch defective....should I have moved the lever to the tow position after the hitch slid????