The KOA in Wawa isn't a KOA any more, if it's the one just north of Wawa that's being referred to. Yes, it's a forgettable RV park but we stop there as it's a long day for us to and from the Sudbury area. They have 30 and 50 amp service and water, there is a dump site near the office. The long distance with no gas south of Wawa almost to the Sault shouldn't be a problem for the OP but I saw a stranded motor home (out of gas)on that stretch before.
You get the cheapest diesel in the north in Dryden. The Husky there is easy to get in and out of.
