Changing a propane cylinder where we are making and breaking at about 7.5 bar at just 10C, that is some 250 times the van's systems pressure, must be way the most probable area for us causing a leak?
The danger mitigated a little by it being a joint out of the van, though a process undertaken many more times than we break joints in the van.
Seems odd, though thankfully the case, we are left trusted to undertake this HP LPG work, but little else without professional oversight?
IMO, all part of the stupidity to move from bottle regulators over to bulk head mounted, where far more joints, and more vulnerable items are at HP.
Massively increase the risk, for what?