I had a big problem with my fresh water this past weekend.
My son had borrowed my camper and left water in the fresh water tank. Then next weekend, my other son borrowed it and he said the water smelled like rotten eggs. When he got it home, he put white vinegar in the tank and flushed it out.
A month later (last weekend) I am running the water and the water coming out of one faucet (not sure if it was the hot or the cold) smells SO bad!

To me, it smelled like almond extract. It was so strong it set off the gas alarm.
I got behind the tire and drained opened both drains. Water coming out of one drain had the smell and the other was okay. Why are there two drains?
Any idea what could be causing my problems?