I would check the rear sway bar (track bar?) mounts (bushing and bolts) to see if loose. My old jeep would make a popping noise and I found one loose a long time ago. Also check to see if the rear shocks are tight (top and bottom). Let us know what you find so we can track for future reference.
2017 Axis / 25.4: Big Foot Levelers, Aims 1200 Watt inverter, Ceramic Window Tint, Full River AGM 6V batteries, Front Hellwig Sway bar / Rear Track Arm, Safe T Plus Steering Stabilizer, PD 4655 converter, Hard Wired Surge Guard, WEboost + WiFi Ranger, LED Headlights/Driving lights, TPMS, Surge tank, Tornado flush, Viair Compressor