But every once in a while, I have run into left hand threads. Wouldn't work too well on RVs for all the non-handy types out there that would end up forcing them on.
It just doesn't seem right to be using a conical shaped lug nut when the holes in the rims are drilled into flat metal with no mating conical shape. The sides of the lug nuts get forced against a sharp right angle edge.
Have been messing around with vintage European cars over the decades and the steel wheels have a cone shape with a lug nuts or bolt specifically for steel. And the alloy wheels use a different nut or bolt and they also have a different taper angle.
Can't see the conical nuts holding as wheel on steel wheels or centering as well as alloy wheels
Just seems like a cheap way of doing it on RVs, but it's in keeping with other things tho... :R