I have a 15’ in there now. No pics, it’s just a couple of holes drilled in the bottom of each Action Packer, spaced to match the holes on the platform. Bolts inserted from below, with large rubber and metal fender washers to protect aluminum of the platform and spread the load, and wing nuts inside the bins.
How long of a sewer hose can you fit in the 8 gallon action packer? Also how many bolts did you mount yours with and do you happen to have a picture of it mounted. I'm considering mounting one or two when I get my trailer.