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I have seen good sized trailers at canoe harbor campground on the
south branch.. You will probably find some other FAOL people there also.

Try Keysone landing on the river.

One warning....the road into the kneff lake campground is terrible. Plan on crawling along at low speed for a mile or so to prevent vehicle damage.

There are several R.V. campground near Grayling if you need full hookups. Google Grayling Mi campgrounds. There is a national forest campground at Kneff Lake near Gates Lodge if you can get by...