FWIW, I think the issue is the dubious placement of a heavy marine deep cycle battery in the weakest spot of the camper shell structure. The battery weighs more than other component in the camper shell structure and is simply going to stress the galley flat/bulkhead joint too much. Additionally, it is also relatively high up in the structure and raises the center of gravity too much. An AGM battery can be mounted sideways on the trailer structure right in front of the axle which lowers the center of gravity and avoids putting stress on the galley flat/bulkhead joint. “Fritz” (sp?) on this site mounted his battery that way and provided some pictures of his installation. I just received my CLC kit this week and am still finishing up my parts inventory but I will definitely not be putting a heavy marine battery in the CLC galley location. Every pop up camper made in the last 40 years has mounted the marine battery(s) either on the trailer tongue or in the very front on the camper box (on the floor) for proper CG and trailer weight and balance purposes. The CLC design simplifies wiring at the expense of raising CG and stressing the galley flat. YMMV,
Mitch