I agree with Fire Instructor. Check that the bulbs match the fixture. My Surveyor uses bulb type 921 in all of the interior light fixtures. If a higher wattage bulb was inserted, higher heat would have been generated. I'm not sure the maximum rating of the fixture, but there should be a marking of some kind, either the maximum wattage, or the bulb type(s) to be used.
Why did one light not work, then work, then burn out? Can't say for sure, but perhaps it was a loose connection. A loose connection could also cause excess heat at the socket.
I would also check the voltage of your 12V supply in the trailer. It shouldn't burn the light sockets unless it is excessively high, but I would check it just in case. What makes me think this could be a possibility though is that you are having trouble with more than one fixture. Have you noticed anything else wrong, or broken, that runs on 12V?
I have recently upgradded most of my 921 bulbs to the LED equivalent. This could be an option for you too, if everything else checks out OK.
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