Seen this with Travelzoo yesterday. I can't remember what the past snowmobilers rates were but includes some extras.
https://www.travelzoo.com/ca/hotel-booking/hotel/5728/fairmont-le-manoir-richelieu/?=&pageId=b2534ce4-e3e9-4c65-b06b-0d322b512a85
Now have to decide when to go or maybe have a QR meet up
They do have a large open parking area. I have seen rigs there in the winter but no idea if its an extra cost. I've only once gone in off season and frankly it was a crappy road ride. I would leave from Quebec City or other off the highway and make this a stop by sled.