It's usually pretty easy. Begin by shutting off the gas at the propane
I've never done it on a Trillium
but have on four other rigs. Usually the top lifts up exposing the burners. This might require removing two screws or pressing a clip. Sometimes it is just a pressure fit and flips up.
Lifting the top may expose the gas line connection. We again make sure we have shut off the gas at the propane
tank. When you disconnect the gas line there will still be some gas in the line that should quickly dissapate.
(If this does not expose the gas line connection, it will certainly be under neath the stove top and can be disconnected there.)
We than undo the gas line fitting, usually a copper line about 3/8" in diameter.
Their may be a couple more screws that hold the top in after you lift the burner cover.
Once we have disconnected the gas line and removed the stove we put a plug in the gas feed line to prevent any leakage should some one open the propane
Hope this helps,