Trailers are great to have for many things, so I'd buy one.
I bought a good used unmarked enclosed trailer which is anonymous because no one else needs to infer I'm carrying anything interesting. I consider "vanity trailers" such as those frequently emblazoned with the names of a certain other motorcycle marque to be childish theft bait.
One of my buds asked why I don't get a "pretty" trailer, and I said that I'd rather improve my security by parking next to his pretty trailer.
White is a common, anonymous color and doesn't get as hot in summer so you can use it for a place to stay if you like.
I always get dual axle trailers. If you lose one tire you can limp to safety and not be forced to halt immediately for a tire change.
Weight capacity is good. More is better. If you go used, repack or replace the wheel bearings and do a thorough inspection.
Mine resembles the attached pic. It's deck is low enough that I pushed my FXR into it single-handed fairly easily and has E-Track strips for cargo securement (great for motorcycles). I use old mobile home beam for ramps. It was free and the edges keep wheels in the ramp.