To Fhenn's point: Yes.
Assuming you meant the valve at the tank. Everything else in the trailer that uses propane (inside stove/oven, water heater, and furnace) was tested and worked correctly.
To Burgy's point: Yes I did, but here's the full story...
When we picked up the trailer, the hose that connects the range top to the camper propane source (there are 2 side by side) was missing, so they gave me a new one. I did not hook it up and test it right then
, because everything else on the walkthrough worked. When I tried to connect it on the shakedown cruise, the male connector on the new hose would not fit into either of the two source outlets. Another camper had a long hose that we tried, and it did connect, but the stove would not work. I did open and close the small handle but to no effect. When I got home Sunday, I went to the hardware store and bought a new female connector to install and try. This one does not have the handle. My hose connected just fine, but still no gas.
If your suspicion of a clogged line is correct, I assume it has to be in the line connected directly to the range top. How do you go about cleaning that?