Bicycle Trailer laws (West Coast)?

I plan on building a 6'3" x 4'5" trailer (same size as a full/double size bed), to be pulled by bike. It's going to be similar to a teardrop trailer (obviously smaller and lighter) but made from thinner materials. It will be between 4'2" and 4'8" tall. I plan to make a trip, so I will be living out of this trailer. I was just wondering if there are any laws governing these types of bike trailers in Oregon, California, Arizona, New Mexico and Texas. Any info helps! Thanks!