There was a thread about someone who got a ticket pulling a boat in the hammer lane last week. Just some info, I saw the sign on I5 going south right across from the weigh station in Dupont that states something like
Autos with trailers or over 10,000 GVW prohibited in left lane. So, it looks like no matter what your GVW is you cannot be in the left lane for passing or any other reason if you are pulling a trailer. I didn't know this either, maybe a Thurston county thing? I don't know how far south this applies, or how far north, but it seems I5 is pretty picky about trailers!

Watch out for Mr. Bear, he is everywhere down here!
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Organized people are just too lazy to look for things.