@BLUWAGN do you happen to have a pic of the result? I just put F150 wheels on my XLT and although I was prepared for the axel shaft issue, I missed the offset issue (oops). I *think* that 5mm/10mm would work, especially since I put on aggressive tread AT (Toyo Open Country) tires. Also, can you confirm that you used standard lug nuts and avoided any changes to the lug bolt shaft? Obviously, on the rear, the total length will be 10mm shorter and I'm concerned that now the OE lugs would have commensurately fewer threads engaged.
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I don't have a picture of the studs showing on the rear before the lugs went on. I counted the threads on the lugs before I ordered them, I'm trying to remember but I think there was about 15-18 threads slowing without the nut installed. These are 1.5mm pitch lug nuts so that means about 6 threads are covered by the 10mm. Quite a few threads left to engage the nut and not a worry by me.