Trailers for scooters?

[nwscooterboy]

I did a thorough search here and at other places and can't come up with much regarding little trailers for scooters. I'm not even finding a definitive answer about the legality of it in WA state.

Assuming it's legal, has anyone had luck doing this? I'll be getting a 150cc Scooter and would love to tow a small cargo type trailer behind it to do some camping. (my initial "a-ha!" moment/vision was a 6' long flat thing that I could open a pop up tent onto and make it a place to sleep, ha ha)

I'm pretty handy with a wrench and was thinking I might be able to even build something but want to get other people's opinions first.