I haven't seen anything like that before. I had to convert your image from .webp to .jpg so I could zoom in. From the pic it looks like the sidewall is pushed out where that piece is sliding down. Very strange...
2018 North Point 377RLBH, Roadmaster Comfort Ride, Dexter E-Z Flex Suspension, Flexair 21k Pinbox, Victron MultiPlus II 2x120v 12v, power distribution, solar controller, smart shunt, 800w solar panels, 4 Lifepo4 200ah batteries
2017 Ford F350 Lariat CC DRW LB 6.7, Air Lift 7500XL with Air Lift dual channel wireless