Jackson, MO is actually south of Ohio, so seems unlikely they would go south before they went north. IDK. Depends on whether they wandered around some before heading to AK. The most direct route to Kenai, AK from southern OH would be northwest through Chicago and beyond.
The last known presence of the Wags in Ohio per our timeline was AW's interview with LE on May 16, 2017. By June 19, Reader and DeWine had put out an appeal for information about the W's.
Since Montana is also on the evidence list, and since they crossed the border there, I'm guessing it's Jackson, WY, but I could be wrong. Ohio makes sense too, could be they hung out there for a couple weeks after the interview AW had with LE and after the farms were searched. I kind of wondered after that search in May 2017 if KW didn't tell them to get out of town.
Link to Timeline
OH Pike County: 8 in Rhoden Family Murdered Over Custody Issue 4 Members Wagner Family Arrested#44