As an addendum, I wound up having to grind away four curved recesses in the top of the hitch lateral frame rails to accomodate the rear leaf aft spring mounts; almost a 1/2 inch for the forward edges of the mounts and almost 3/8 of an inch for the rear edges of the mounts ... this on the advice of and by a reputable local RV trailer fabricator. I cleaned up their work to uniform and smooth proportions and then re-painted the entire hitch with several coats of Zero Rust ZER28-62SP black spray paint. I've used Grade 8, 1 1/2" x 1/2"-13NC bolts and nylock nuts with the original galvanized square plate washers (top & bottom) to mount the hitch and torqued all to 64 ft./lbs. Even if some authority was to object to the modification of the hitch in this manner, the finishing work makes it extremely difficult to detect at this point.
BTW - the 'C' shaped braces don't fit worth a **** when swapped L for R, however, as I won't be relying on the step-bumper for anything more than Class I duties, I don't see any harm in leaving them off.
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