Welcome to iRV2.
You did not say who the manufacture of the jacks was. My gut feeling, Clayobx is correct with his answer. If the jacks are HWH you could call them at 800-321-3494. Good luck and report back when you solve your problem as we all learn from each other.
Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014