I had this same problem the first month I had my trailer and now it's back. Redwood arranged for another dealer to look at the problem but they couldn't figure out why I wasn't getting water to the washer. I finally found the problem myself and everything was fine until now.
I'm going to go to Menards to buy a plastic piece made for "pex" pipe that is intended to use while plumbing the house. The purpose of this piece is to prevent the "pex" pipe form kinking too much. By zip tying the water line on this, it should prevent the kink. If you find that yours is kinking in a straight area, then just zip tie some sort of "splint" to it. I believe once the water line has a kink in a particular spot it will continue to kink there.
I thought I was having this problem because of my slid-in-slide. With the slide-in-slide that water line has to be longer and I believe that's the problem. This next week I'll give it a try and see what happen, then report back.
SOB "The RV Wiseguy"