These are all good suggestions from seasoned diagnosticians.
I thought for sure the problem was in my steering column. Whether that was the case or not, at least it got me motivated to pull out my entire steering column and rebuild it. Now my truck will be safer as a result.
I suspect I will eventually find something wrong with the horn relay. That’s the only thing that really makes any sense. I did not have any problems with a dead battery until the horn problem reared its ugly head. I’ve somehow convinced myself the horn relay is not the problem, but I will check that theory again before tearing anything else apart.