Not sure why the phone number 450-474-2809 points to CSSS de Coaticook:
-Area code 450 surrounds the Montreal, QC, area.
-Coaticook is a town about 100 miles east of Montreal, where area code is 819.
-In Quebec, a CSSS is a Health and Social Services Centre (CSSS stands for Centre de Santé et Services Sociaux). It's a kind of government-run medical clinic, and they are everywhere in the province. I don't picture them selling a FG trailer, the Coaticook office's phone number is not the one above, and definitly not in the 450 area.
-4 rue tisseur Beauharnois, QC J6N 3A7 seems to be a private residence address in Beauharnois, QC, located in the 450 area just south of Montreal, and could be a probable seller. But Googling this address comes up with a different name and phone number than the one on the ad...
Also I couldn't find this trailer up for sale
on the two most popular classifieds websites here in QC, lespacs.com and Kijiji.ca.
So yes, be careful...