I'm preparing my sunset trail for my first winterizing. There are 2 plastic hoses under the trailer. Is one for the fresh water tank and one for the water heater? I screwed off both plastic caps and was surprised how little water came out. After taking the drain plug outta the water heater and draining that, I noticed one of the hoses started draining more. Do you just have to take off the two screw on caps or do you have loosen or take off the other threaded knobs on those hoses? Turning on all the faucets in the trailer seemed to help with water coming out but still didn't seem like a lot of water draining.
Wader, one is hot and the other is cold low point drains. You remove the caps, open the valves and then open all the faucets, flush toilet, open shower etc. There is another one (cap only) for the fresh water tank.You already found the drain for the water heater. Don't forget the outside shower.