I had no idea that the Glen Rouge Campground existed! Thanks, kenandterry.
Hutch33id, if you are interested in going further east for a FHU site, you might consider the KOA in Brighton, ON.
Brighton, Ontario Campground | Brighton / 401 KOA
It's a little over an hour east of Toronto and right next door to beautiful Prince Edward County to the east for a nice scenic tour. They have 50A FHU sites that will easily accommodate your large 5er. It's a nice campground out in the country but I've found the water pressure can be a bit low. I don;t know what there policy on guests. You'd have to email them to find out.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)