I would check around the cover on the side of the RV. Perhaps you need a bead of silcone alone the bottom edge on the inside of the compartment? I know on my frig it looked like water could leak into this area after a hard rain so I put a bead along the bottom to be safe. Or the cover is not fitting / sealing correctly?
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