I had an older Hallmark camper before my FWC that had jack brackets coming loose from the camper, due to being partially pulled out. We had to load it with portable jacks due to the damage. I went to a local welding shop and had new brackets made. The new brackets were similar to the original brackets, but used bolts that went through the camper with backing plates inside. In addition, the new brackets had gusset plates on the bottom to add additional support. Worked great, and weren’t too expensive.