Here's a link to a good summary of the Federal requirements for trailer lighting and reflectors:
I ran across this link while searching or requirements for trucks and vans, since I plan to add conspicuity tape to my Interstate. I can't use it, but maybe you guys can.
Airstream trailers already come with all legally required markers and lamps. If you add conspicuity lights or reflectors beyond the legal minimums, it's probably a good idea to comply with the placement requirements for larger trailers, and not just put them anywhere you feel like putting them.
Mexray's all-around blue lighting would be illegal in Louisiana, according to Louisiana Revised Statute (LRS) 32:309. This link should give you a good starting place for determining the legality of nonstandard lighting by state…
Unlawful Vehicle Modifications: State Laws - FindLaw