Hi, Beth. Since this topic is getting so long, you might want to start your own thread in this Moravia board.
But I have something for you. Margie Sobotka's book, Nebraska Kansas Czech Settlers, lists Jan Trutna on page 139 Saunders County as coming from Kerstov, Trebic, Jihlava. Small problem: actapublica does not list Kerstov, so it could be a misspelling. If you get your topic out as a single, some of the experts might pick up on this name and figure out what it really is. Jan Trutna is the only Trutna listed in the book, so we might theorize that he was a relative, perhaps brother or cousin, to your Joseph.
Digging a little further, I entered the German name given in one of the early posts, and came up with the Czech spelling Gersov (with a hacel over the s). And that one is in actapublica.
I took a quick look at the index for 1860 to 1897 and did not find any Trutnas. Do you know a date of birth for your grandmother? Was she born here or in Europe? I assume here. Do you have any birthdates for her parents?