White River Campground is a very good contender for your camping needs. It's run by Hamilton County Parks service. It's a very clean, full hook-up, all site asphalt campground. There are two sides to park on, the river side and the pond side. Either side will comfortably park a 40 ft "pusher". We've camped there so many times, we've lost count. There are 2 price rates. Those who live "in county" and those who do not, considering this park is subsidized by local county property tax, it's only fair "in county" residents get a lesser rate. But even with that, their prices are reasonable.
It's located North of Indianapolis, between Cicero and a little hick town called "Strawtown". (Both are North of Noblesville). Check out the link above.
You'll be about 40-50 miles from Speedway in Indianapolis, but I don't think you'll find a nicer campground, unless you go to a state park. The next closest state park is Mounds State Park in Anderson.
There's a little private campground very close to where I live. I've never camped there, but drive right by it all the time. You'd be about 40 - 50 miles from Speedway also. Very easy access to I-69.
Glo Wood Campground