My hot water isn't working. I'm wondering if it's because the pilot light is out... where is the pilot light so I can check?

Contact your local retailer directly or online here

It's possible that your system is working correctly but one quite unknown thing can cause the water to be only lukewarm. If you have an outside shower or outside faucet by the dump tank panel check to make sure that the water knobs are turned off there. Sometimes someone will turn both hot and cold water on at the outside shower controls and turn off the flow using the shower head shutoff instead of the knobs. This allows the cold and hot water to mix and make the flow inside the RV to be only slightly warm.

You should be able to see the pilot light when it is dark outside. Even when it is not dark outside, you can probably see it if you peer inside, but you should also be able to hear it if you are in a quiet area. You can find the pilot light by looking at the heater and identifying the gas pipes: they are typically a little corroded and have valves on them. Just follow the gas pipe into the murky depths of the heater and look around for the blue flame. Sometimes you'll see a thin-diameter tube branch off and run in tandem with the main pipe: this conveys gas to the pilot light. Finally, you might have to open a little aluminum cover and peer inside. If you don't see a flame, you can probably identify about where it ought to be because you will see the main burners. Of course, the pilot light should be right next to the main burners and if you don't see/hear/feel heat there, your pilot is out.