I went through this same discussion when I was trying to find out if I could use the original rims on my 49 1-ton. So here's a link to an article that you might find interesting and it seems to provide some details on what is, and what isn't, a "widowmaker" rim. Read the article on "Setting the Record Straight". Hope this helps. The 3-piece rims don't seem to fall into this category but it all gets down to the condition of the rim, regardless of how many pieces there are.
http://www.retread.org/PDF/SettingTheRecordStraight.pdf
