OK folks this is just on the right rear. I just installed my 8/32 evenly worn tires back on and balanced. Alignment was done about 5k miles back. The set I removed were down to 4-/32 except the right rear which was at 2/32. I have about 1k miles on this set and see the right rear is feathering. I will have alignment rechecked this week. Any other known culprits to this? Thanks.

The brand of tyre can make a difference.

By way of an example, Continentals were standard fitment on my SC and they're known to show outside edge feathering, as indeed were the ones supplied on mine when I bought it, yet the Pirelli Scorpions I've had for the last 3 years have been fine. Si. <This is my name.

I eat rat poison.

A man ain't truly been insulted until he stands buck naked in front of a woman and she didn't even notice. Or care.

Pirelli Scorpion MS. Remember it's just the right rear tire.

Mine were like that when I bought it more so on one side but am sure both rears were affected and they were Pirellis,i only do low miles so not really noticed on the newer tyres as yet.I guess all you can do is replace bushes at the rear which may only have slight wear but may be the culprit but you have a few to choose from .
Get a second opinion from another alignment centre.

I appear to have this sorted out. Seems the toe was off on all 4. Worse on the right rear. I guess I will need to have alignment checked every 3 months on this car. Here in PA you can off road while on the highway.

It may be a good idea to change the place You do alignment at.

I have a 3 yr alignment deal. I haven't had problems with my other cars but none were 5400 lbs. Think I'm going to need a balance deal too. They said the larger tires needed balanced more frequently too. Maybe 3k miles and I can begin to feel the front vibration.