I agree about that KOA, it is called Monroe KOA, Petersburg, MI, off US 23 at the 9 mile marker. The last time we were there, was just a couple of years ago with the twins for a week. It was VERY VERY pricy, charged extra for everything, they sure are a pure example of the Keep On Adding name that KOA has. They charged extra for the girls, they were going to charge us $5.00 extra per day PER dog, that was when we had 4 yorkies. Al bartered them out of that one, telling them we would book for a full week if they waived that fee, the dog fee, which they did.
But, parking Tana in there was a challenge, Al did danged good, but, wow, talk about a tight fit?? UGHHH
It was ok for us with the girls, as they wanted beach time, dogs and camping. It was a good place to stay as we also wanted to take them to the Toledo Zoo. I believe they had hay/wagon rides just about every night, maybe it was weeknights?? whatever. They have a huge water slide, which is extra on the weekends, during the week, they let the girls ride 2 days all they wanted, no extra, included in the camp fee.
For all the negative I have said here, have to say, the staff was really nice, really trying to please, etc.
Now, other considerations: State Park at Sterling, over by Monroe, right on Lake Erie, have not been there since they moved the campsites out to the lake, but hear there are some 50 amp full service type sites, but, don't take my word for it, check out:
http://www.michigan.gov/dnr
Also, I heard there is a new(er) campground in Monroe, suggest you email or pm Glenn and Lorraine, they stayed there last summer, I do not have the details, but believe it would be a full service campground, full hookups, and sorry, no, I don't know the name.
Monroe is not toooooo far from Toledo, between the two there used to be a Outlet Mall shopping thing. Luna Pier??? area.
Have not been in Pirolli in such a long long time, way back mid 80's ??? Live within striking distance, have not much interest in going back, and will let Glass Guy's remarks stand.
Enjoy your visit to Michigan. By the way, Al and I rarely camp anywhere BUT state parks in Michigan. If you want more details on some of our favorites, feel free to email, or ask here on the forum.