Some suggestions for stops along the top of Lake Superior:
Thunder Bay KOA
Neys provincial park east of Marathon has some great sites looking out on the lake (30 amp electric only, you have to run off internal water and use the dump site), check the website for open dates.
Penn lake park in the Town of Marathon is a full service RV park on a small lake, a hidden jem.
Pukaskwa National Park east of Marathon offers some great hiking on the lake shore, only 30 amp electric, not sure about water and dump site, last time we were there they weren't operational.
Lake Superior PP was suggested, we find it to have too tight spaces and roads for our 39 ft. 5th wheel RV, it got scratched up last time we were there.
On the way south to Toronto and Niagara Falls there are numerous private parks that are suitable for your rig.
