The right is about 1/2" out of plumb tilting in at the top, your standard "A" rear camber (instead of the tilted-out V) while the left side is nearly a full inch out of plumb, making that A lopsided.  Trying to loosen the outer pivot bolt is a chore but more important is, what the heck actually gets adjusted?  The Bentley says to insert a screwdriver into the slot and adjust, but for someone expecting a starwheel-type adjustment device I'm mystified seeing open air on the other side of the slot.  Do I just pry on the trailing arm itself to move it up or down?
This is one of the little things I thought I'd address before setting out on a trip this week, the first one in a couple of years for the Westy.
Thanks for the help.
Stephen