Mine too, I'm gonna tackle that one of these days :-laf
My driveway is gravel and uphill, when I stop on Mondays to pick up the trash cans I have to wait for my truck to stop rolling backwards before I get out :-laf
I saw the adjuster under the driver side (while changing fluids), but it looked like it would only adjust one side.
A quick read through in the manual says to leave that adjuster alone and adjust the shoes like any old drum brake system ... ... ... ..... we'll see.