1933 CCM Bike Wagon - with Skis !!!

I watch for CCM Bike Wagons on Kijiji across Canada, and this one came up today. I have never seen bike wagon before, that offered skis as an option.

And they look so well made, that perhaps they were an actual accessory that could be purchased for the wagon? Anyone know?

Pretty neat to be able to remove the wheels at end of summer and then install a set of skis for winter.

Its for sale here - https://www.kijiji.ca/v-art-collectibles/london/antique-1933-original-ccm-wagon/1503789862?undefined