I would heed Stepf's warning and advice.

How difficult is it for a cop to see that the state of your tow rig's plates differ from your trailer's plates?

Not very. Your real state is losing reg. fees and taxes and is going broke.

Freinds of mine have actually used Maine registries in a pinch for a vintage car that we had no title for and wanted to sell it. That worked because the sale was quick and the buyer was from a whole different state. We did not want a vehicle with Maine plates on it for a lengthy period of time that would be regularly driven.