That is not what I have in my trailer, but the basic workings are all pretty much identical.
 
The burners that I have in my trailer are elongated, roughly 8 inches long by 1 inch wide. There is a pilot light directly next to the center of the elongated burner. I push and hold in the control knob while manually lighting the pilot light. The pilot light in turn heats a copper coated rod (thermo coupler) which when to a proper temp tells the control valve to release gas through a separate gas line to the elongated burner, which then lights off of the pilot flame.
 
Once you get a good understanding of how these systems work they are pretty easy to trouble shoot. One of my biggest problems is carbon build up in the pilot, which is also adjusted by that screw I spoke of in the regulator valve. I have tried various cleaning methods on the orifices in the pilot but found the easiest cure is to just buy the needed pieces new. In 6 months I have had to replace two pilots and one valve. The parts are all Chinese made and the quality is not what one would expect from our US manufacturers, actually it is very disappointing.