Quicker yet would be a .45 ACP pistol, such as a Glock G-36 or G-21 if you have large enough paws. Even a 9mm such as G-19 I carry when in WA would be a step up from nothing.

Concealed carry is legal in WA with a CPL and while your supe can inspect the truck, he shouldn't be inspecting you. Why plan to use a half-assed weapon when you can carry a real one that will be more than a warm blanket. $.02