I had that same rotten eggs smell in my race trailer, took a while to track down. Turned out to be battery acid from the coach battery (I only had one at the time, now two) I was smelling. The 12v power supply/battery charger (parallax) had gone bad and was overcharging the battery and boiling the acid creating the intermittent odor. Kept getting to be more often we could smell it til we just kept sticking our noses into strange places to track it down. Our battery is hidden behind the fifth wheel landing gear, so we finally found the smell in the hole for the jack handle. That was a "wtf" moment til I remembered the battery was behind the panel as well. Ended up replacing the "guts" of the charger, and by that time the battery was shot as well so I replaced it with dual batteries. Been fine since. Good luck.
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