Warsaw Indiana's Pike Lake Campground has campsites available for seasonal, monthly, weekly, and nightly rentals for RVs, campers, and trailers only. There are about 45 tightly-packed sites with shower/restroom facilities. Located right next to the lake and park, there's a lot to see and do to keep you busy during your stay.
We stayed for a night in mid-May while traveling through Indiana. Nearly every site (if not all) was occupied, but very quiet for a Saturday night. I'm thinking this location is primarily monthly/seasonal rentals and a bit too early in the season for the renters to be camping at their sites. Everything was clean and well-maintained. What few people were there seemed friendly. The sardine-style RV park setup doesn't offer much for privacy, however.
I'm surprised we were able to get a site since it seemed like a spot that caters to mostly longterm campers, but it's still early in the season. For me, it's a convenient, safe, and clean stop when traveling through Indiana.