One thing about those pictured tank mounts... they don't appear to include the regulator and solenoid, which appear to be inboard somewhere (or aren't actually installed for those pictures.) Most of the propane leaks that I've encountered were due to failures in the regulator. In fact, I currently have my regulators (stove and heater each need one) mounted to the inside of the transom, over the scupper. When a regulator failed, the fumes filled up the cockpit and rolled down into the cabin within a few seconds - way faster than they could drain through the scupper. (I didn't wait to see if the sniffer/alarm would work.) I have seen the light. Propane locker version II on tap for spring. I'm not so worried about the lines to the stove/heater, as long as they are solid, unbroken lines with no fittings along the way. Of course, there has to be one bulkhead fitting and one at the appliance.