The danger comes with how the three tanks were designed by the factory to connect together. If all were connected to supply simultaneously (all at the same time) then you have a serious problem.
Try this... Shut the gas off at the two remaining tanks. Let the unit air out. Turn one tank on and put your ear to the third connector and listen/feel for gas to be leaking out. Shut the tank off and do the same with the other remaining tank. If you are hearing/feeling or even smelling a gas presence out of the third connector, PLUG IT!.
I'm not familiar with gas connection setup for multiple tanks. My best and simplest advice is to plug that third connector by cutting the line and putting a proper cork on the end of it. What I mean by a cork is not a physical cork but a properly capped line with the right Hardware so that there is never a problem of leakage.
The biggest concern with propane gas is that it is 1.5 times heavier than air and will find its way to low-lying areas like the floor of your camper and then fill from the floor up. Then, once it finds an ignition source whether a spark from someone plugging or unplugging an appliance or a fan or any other spark generating device, the resulting outcome is not pretty. Be safe and plug it and hope that's your only leak.
Finally, my mentality is if there's one leak, look for two. If there are two leaks, look for three. If there are three leaks... You get the idea.
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Jerry B.
"Stateboy" (Formerly "36fire412")
SW Lower Michigan
2016 X254
2012 Toyota Tundra Crewmax TRD 4x4
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