Anyone know Thousand Trails at La Conner or Chehalis, Wa?

We will use the camp gd rest rooms except at night or emergency. We have large holding tanks plus we take the grey water to the dump just outside each rest room. We can manage for 3 weeks then go to the Mount Vernon TT. Only 12 miles or less, stay over night or head south on I 5 at the rest stops as a lot of them have dumps