I would place a call to their office. I know theres another spot on US37 and Edgewood just a few miles from Indy Lakes.
I'm gonna have to say that I'm unsure about a flat rate... Let's face it, a place that charges for the use of a SHOWER probably isn't looking to cut a deal. However, they do have Full Service Lots at $480.00 a month. This will offer you a quiet lil spot with electricity (a deposit is required, price is $70-$120 depending on which amp you pick) water & sewer are included. Sweetš This rate is suited to fit 2 adults and 2 children. I hope this helps... Go Hoosiers
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