Here's the reply from WDFW regarding a second plate on the Discover Pass:
"nfortunately, the Discover Pass is non-transferrable and only valid for
one vehicle. The Discover Pass legislation specifically states the pass
applies to one vehicle. A change to this would have to be done through
the Discover Pass committee and Legislation.
The Vehicle Access Pass that you receive with your Fishing (or Hunting)
License is a "complimentary" Pass that comes with your license, that you
do not purchase, therefore, it only allows you to access Department of
Fish & Wildlife Lands and/or water access sites. The Discover Pass
allows access to any state recreation lands and water access sites
managed by Washington State Parks (State Parks), Washington Department
of Fish and Wildlife (WDFW) or Washington State Department of Natural
Resources (DNR). These lands include state parks, water access points,
heritage sites, wildlife and natural areas, trails and trailheads.
For more information please go to the Discover Pass Frequently Asked
Questions at:
http://discoverpass.wa.gov/faq/ OR to the Discover Pass
Home Page a:
http://discoverpass.wa.gov/If you feel your questions regarding the Discover Pass was not answered
adequately, you may also contact us directly by phone at: toll-free
(866) 320-9933.
Thank you,
Customer Service Specialist 2
WDFW Licensing
Olympia, WA 98501
(360) 902-2464"