Don't know.

But yes, from what I've read, it's actually very common for the older heavy duty trucks to have Left Hand threads on the Driver rear wheel, even on other brands of truck. I have an F350 so its got the heavy duty floating axle and hubs..and yep LH threads (only on drivers side)

 

Same here.....LH threads on drivers side rear wheel.....

 

 

in theory a rotating wheel imparts forces on the lug nuts, one direction self tightens, the other self loosens.
I think that mostly applies because of the quality of older vehicles/parts.
Chrysler products in the 60s all had left threads on one side, I thought it was the passenger side, but it's been many years since I worked on one.

 

I wonder how far you can drive in reverse before both wheels fall off???

 

This is funny!!!

 

You can put balancing beads inside the tires, and remove all the outside weights, for a lot less than the 80.00 bucks quoted. I have gone this route and am very satisfied with the results. Depending on the size of the tires, the amount of beads can very from 4 to 6 OZ. of beads per tire. A web search for the beads will get you all the info needed to get the job done. I used 5 OZ per tire that are 30/9.5/15, a standard 235/75/15 should take 4 OZ.. You can get the do it yourself kit for around 40.00 bucks. It is easiest to just take the tire and rim off the truck and lay flat to get the beads into the tire. Big trucks a d the guys with big tires have been balancing this way for several years. Some even use golf ***** in semi truck tires to do the trick.