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I think that map is pretty close to the location. County Rd 2150N stops and starts a few times. If you zoom in and look a bit farther to the west, there is a section of the same road that stops right next to the river. I would guess that is where the truck found (but I'm just guessing).
I didn't know Disclosure had a website now. That may not be the best place to get your info...it's kind of an underground paper, dedicated to revealing corruption in Southern Illinois. I'm not sure why they reported that Jacob Wheeler had been found- every other up-to-date site is saying he is still missing and is a person of interest.
It is still possible that someone killed them both, or that they abducted him. I guess it is possible that he could be in the river, but the Little Wabash is not very big or deep. Especially now that we've been in a massive drought all summer. I don't think a body would stay hidden in there very long.