No indication of what RV make this is. It appears the walls were cut short. I think it needs to be repaired properly, wall rebuilt and caulked. That gap will be a mold haven.
46 Years RVing and no end in sight.
2018 Ram 3500 SB Limited, CC, 6.7/Aisin, 4X4, SRW. Comfort Ride Energy Absorbing Hitch.
2020 Cedar Creek Hathaway 34IK, Reese 19K Sidewinder PB.