i have been to the morrow county OHV park quite a few times. it is geared more towards ATV's, maybe jeeps, but the trails are not fullsize friendly. there are a select few trails for "jeeps" and there is a rock garden (more of a rock quarry) to play in. just last year they finished the medic building and air pad, during the summer there is a food vendor, along with camping spots and wi-fi internet (havnt tride it yet).
they just added another 2000 acres last year with new trails. so if you also have an ATV it is a great place to go play.