Just a word of warning to my New England friends out there: The states in New England are starting to crack down on the ME registrations. (MA is actually getting a bit more aggressive with other things like weight and CDL requirements now too)
If they find you are registering your trailer through a company, and have no legal address in ME, you do run a risk of getting penalized for it.
I am not sure if they can try to hit you for back sales tax and stuff like that too, but I wouldn't put it past some of the locales to try.
I would guess it's only a matter of time before specific laws banning registering like this are put out there. They want every last drop of blood they can squeeze out of you.
Like I said, consider yourself warned.