mojoroo wrote:
What makes and models are people having issues with?
I expect there are many makes & models with similar setups. It would probably be best to crawl under your camper and have a look at what is under there. Then make changes as needed.
Our camper (2006 Pilgrim International) has a support frame made from angled steel. Then there's a sheet of OSB covered with a vapor barrier type fabric between the tank & support to protect the bottom of the tank from damage and distribute the weight. The support frame is attached to the trailer frame rails over our axles.
Our support frame was fastened together with relatively small self-tapping screws which snapped over time. The screws were really not a good choice for the stress applied to the structure. I removed all the screws, drilled out the holes, and installed galvanized 3/8" carriage bolts. Some of the carriage bolts were a pain to get in place, but with a little grunting they are in there. I also used the same carriage bolts to attach the support to the camper's frame rails.
I don't think any modification would be fail-proof... that's a lot of weight to support. Inspecting the structure should be part of everyone’s regularly inspection.
Happy Camping!
John.