No adapters and no idea why it has reverse threads but the little research I did was my door placard says the truck has a dana 70HD spicer which i guess was manufactured in '80 and in that year they put a revers thread on it. im sure my research is off somewhere so experts chime in but thats what I learned. I originaly found out it was a reverse thread when I snapped 2 different heavy duty socket extentions with my 3 ft breaker bar trying to get lug nuts off.. I also understand that its only reverse thread on one side but not sure because I stopped trying after breaking my tools.
A few years got LH lugs on the LH side IIRC... Carry over from heavy duty trucks. They only just went away from LH/RH threads a few years ago.