As another RV rental suggestion, you may want to try Owasco in Whitby, they are located in Whitby Ontario just east of Toronto. They started out as a VW dealer renting the VW campers, they have expanded to other sizes. Looking at their rental website they have some smaller class "C's" that may be suitable.
You may be able to get a shorter duration rental there and it's on the way east to the locations other posters have suggested.
Web link to OwsacoI provided the link to the main site, click on the rental tag, it takes you to their rental website.
