HI Andy! Welcome to Forest River Forums!!
I don't have your specific trailer so can't tell you exactly where the drain is.
If you crawl underneath and don't see it maybe someone here with the same RV will
As far as the washer hookups I'd disconnect the washer and open the low point drains
and then open the washer hookup valves so the water can drain out of them.
Then I'd close them and do a normal "pump in the pink stuff" winterization.
If you have a washer there must be specific directions for it, hopefully found in the
washer owners manual.
Watch the video in our FAQ found here--