No experience with the AWD but from what I have read on this board in the past is that the rear differentials are prone to slowly losing fluid and damaging themselves and no one ever bothers to check the fluid level. Did you check the fluid level or change it while it was on the lift?
At 91K you need to dump and refill all of the fluids and I'd do the transmission two or three times in quick succession. I'm a big believer in fresh transmission fluid, so I change mine every oil change.
I have plain cotton duck material seat covers from Seat Savers Plus, Inc, Miami, FL, but they do have one or two other materials.
http://www.seatsavers.com/" onclick="window.open(this.href);return false;
As far as your other issues............ Yes the cup holders are too small, never noticed any blind spot problems, the interior plastic seems to hold up well for me on my '04 here in the sunny south, and yes the area under the hatch glass really collects dirt, its the nature of a wagon, dirt filters into ever crack and crevice in the back of a wagon type vehicle.
Charles