Washington requires a front plate. The folks we bought our GT325 from had always displayed it inside, at the base of the windshield and got away with it for 8 seasons.
Not wanting to give the WSP an additional reason to pull us over, I just drilled two holes in the front cap above the "bumper" and attached it with two CRES bolts, stiff-nuts and washers. Saves a lot of hassle with the authorities, even though it's not quite straight!
Frank and Eileen
No longer RVers or FR owners