Wash. Admin. Code § 296-150P-0130
We allow one recreational park trailer to be displayed without an insignia, if you:
(1) Get written approval from us in advance of displaying the unit; we should receive your written request at least thirty days prior to display of the unit. Your request must include:
(4) Place three visible signs on the display unit:
(c) One inside the back of the unit.
The signs must read: not for sale - display only.
The letters on the sign must be one inch or higher.
[Statutory Authority: RCW 43.22.340 and 43.22.420. WSR 97-16-043, § 296-150P-0130, filed 7/31/97, effective 12/1/97.]