At this point I think you could take a logical approach to the problem by working from the supply back towards the appliance.
The propane lines are situated under the coach, at each junction for an appliance there is a 'T' or a straight compression fitting, with the tank valve on, starting at the regulator and using a pair of wrenches, crack open the fitting and check for propane flow (smell). At some point there will not be a flow of gas and the blockage will be able to be determined.
Several possibilities include debris from the tank valve, insect nest on mud dauber, a closure due to foreign object damage or even a closed valve (my unit has two valves in the lines underneath).
This is the same logic as chasing down a electrical problem and should result in a fairly quick answer as to a supply restriction.
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'00 34' Classic Limited (LOVSHAC)
'12 3500HD, 4x4 LBZ D/A CC LB
AIR #12881
TAC OH-10
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