I haven't used the Ohio TP camping areas, but we did pull into an area with the T&T to park while we ran in to grab a sandwich from one of the shops. I would only do it and part with the dollars (20 I think) if needing electricity for AC. It was a nice and clean area and appeared secure. I think there was some slot where you dropped your money in, but honestly I didn't spend a lot of time looking the process over.