You'll have to look at the receiver (mine is mounted on the wall above the battery) and see if it the one capable of running the landing gear. You can compare yours to the different models on the Lippert webpage tech papers. Mine also is not capable of running the landing gear. It takes a different receiver and wiring.
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3)
2019 Ram 3500 Limited w/ Max Tow pkg