I think you may find the issue is not a loose connection that causes concern, but if a full tank gets too warm it may vent out the relief valve. While the inside of a insulated RV may not typically get hot enough when closed up on a hot day to cause the tank to vent, it is not a chance I would take. It does not take much propane to leak out to make an air/fuel mix perfect for an explosion. With propane being heavier than air it can settle in all kinds of low spots waiting for an ignition source. During my time as a Firefighter I have seen a couple of rv's fall victim to a propane leak, not much left.
If it were me, I would keep the tank in a vented outside compartment.
Dave
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