I would be careful there? California has its own permit, which is NOT good in Oregon or Washington. If you cross into Washington from any state during the summer months you probably WILL get stopped - it is a Zebra thing. They set up road checks just for boats! They will check your paperwork at those road checks and if you don't have the correct paperwork best case you will just recieve a ticket - worst case, you may be finding another ride home?
Once a boat (or any vehicle) is purchased in the State of Washington the previous owner's registration (and plates) or NO LONGER valid, for any reason. Plates on trailers and vehicles are actually supposed to be removed. The boat doesn't have to be registrated at all, unless in the water.
Stop and think - When stopped with BC truck plates and towing a Washington plated trailer, what is the first question going to be asked? Based on answers given and proof of ownership, that cop can do just about anything he wants... It really isn't worth it!
Washington
Trip Permits can be purchased at any License branch. They are good in most surrounding states of the the "Northwest states." They have agreements in place with the states. Good in BC? Never checked.
Check the "Oversize or Overweight" limits and permits. If the boat has an 8'6" beam and is setting ON TRAILER with fender and trailer wheels over 8'6" - IT IS OVERSIZE!
You may purchase Oversize or Overweight Permits by:
writing to:
Department of Transportation
PO Box 47367
Linderson Way
Olympia WA 98504-7367
OR calling (360) 704-6340, calling is guite easy.
Oregon
Single Trip Variance Permits
Motor Carrier Transportation Division, Over-Dimension Permit Unit
550 Capitol Street NE, Salem
OR, Phone 503-373-0000 - Monday-Friday, 7 a.m. - 5 p.m.
Walk-In Counter Service - Monday-Friday, 8 a.m. - 5 p.m.
California
For California trip permits, contact the California Department of Motor Vehicles at 916-657-7971; or they can be obtained at truckstops outside of California.
For California oversize or overweight permits, contact the California Department of Transportation (CALTRANS), South Region Permits at 909-383-4637.
You will need the Pickup Location and the Drop off Location for California.