Thanks, guys. Actually, I breathed a sigh of relief when they did fit the rear, because I had forgotten to measure. Spent most of my time worrying about the front, with offsets and clearances, and so on. Anyway, they do fit!

I am very happy with the results. I spent a lot of time on this project (and $) but it was 100% worth it. This is exactly the look I wanted.

As to the issue of "trailer wheels," I am not really concerned. These wheels are rated for loads far in excess of what I will ever put on them. Also, I know that many other bolters have used trailer wheels, and there has never been a reported problem, to my knowledge.