I have been trying to track down the same thing. The Fuel and time to drag the trailer from Mass to Quebec City is a waste. If we are in RDL for one trip and then Sag for another and even Three Rivers, its easier and quicker to park it in QC and pay ??? 100.00 a month or so....
I was checking out several places, UHaul storage ( 3-4 locations in the QC area ) use to do it, but no longer. I started looking at RV storage places, as the SnowBirds would be gone for the Winter and have the room at the lots.
If you find something let us know.
I'll try to remember the place that was looking promising.
Later
GutZ