Have you checked on the outside of your rig on the service side for your cable connection? this should allow you to connect the cable from the park to your rig and with the booster off run a channel check.
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho