One way to keep the propane tanks secure
I purchased a padlock by BOLT specifically to be used with the Dodge TV. It measures 2" inside the shackle and is now keyed to the TV ignition/door key.
I drilled an oversize hole 7/16" in the top wing nut and 11/32" holes through the aluminum frame bracket of the tank enclosure and the propane valve support. The lower wing nut can not be moved either because of the padlock blocking it's rotation.
A photo can be seen by clicking on the number after the word 'images' below my avatar to the left. The photo was taken in vertical mode, but importing it into the gallery made it lay horizontal.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels