Tiny home on wheels as a STR or rental

Are there any counties in Wa where they allow tiny homes & tiny homes on wheels for lease & STR in your backyard of either a SFH or MF?

Curious about multiplying revenue streams.

submitted by /u/ForestRoamer
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source https://www.reddit.com/r/RealEstate/comments/mhlheo/tiny_home_on_wheels_as_a_str_or_rental/