There is an Ervin Roller in the 1930 OH census but he and his family were living in Toledo, ED 53. The census image is blurry but I believe the household members were: head, Ervin, 52, first mar at 31, bp PA, both parents bp U.S., occupation laborer-city streets wife, May, 47, first mar at 27, bp IN, fbp PA, mbp IN son, Johnie, 15, bp IN dau, Mable, 7, bp OH
Don't waste a trip to Maumee for research. Most of the info you want would probably be on film at the Toledo library, if Mable was born in Lucas County and any marriages and/or deaths occured there, too.
Yes, there are costs involved but that would depend on what information you want and where it is located.