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So far the only filter wrench I have found that is big enough for the filter on these trucks is one like this that I got from the Schucks/Checker/Kragen chain
That's the type I wanted when I bought the strap wrench - none of the parts stores in my area carry one that opens more than 3-7/8" - which is about 3/8" too small.....
A neat little tool I saw once was one that fit on the end of a socket wrench and could clamp on the end of the filter. With a breaker bar, you could have your way with a stubborn filter that will not give. Also a little less awkward to use if you have 4wd, since an extention could be used.