Please replace the struts. Struts are a key safety component of the suspension. As Jay said, switching the tire will just destroy the other tire, and give you a harsh ride.
New ones can be purchased for as little as $26 each (plus shipping). The book time to install rear struts is one hour each, but if you can change the oil, you can change the rear struts on this car. It's two bolts, and a plastic cover in the hatch area.
My honest , very experienced ,shady tree mechanic begs to differ. he took the wheel apart and install some kind of spacer that helped to align the wheel and tire. I,ve put many miles on the car since then and it drives perfect. And the tires are not wearing irregularly.
No Seattle.
About 40,000 later and I still have not replaced the rear shocks or struts.
The tires wear evenly. No driving problems noticed. It has always been rough on these bumpy streets.
I am considering replacing them. Thanks to all you guys for the advice.
jamesmetairie, you did read my reply in the link I posted above? The last part of my reply tells you what was installed, a tapered shim:
"The rear axle is a one piece unit on the standard Vibe as seen here: http://madstyle1972.com/Repair/27/20ixc/conponen.pdf
If the toe is out of spec and all parts are in good condition, then the rear axle is bent. Either through being hit, damaged, rust through that has weakened the axle metal, metal flexing because of light weight design, etc... can cause the axle to shift and become mis-aligned over time. There are some tapped shim kits that can be used to correct some alignment. The shims go between the axle and the rear wheel bearing hub. The axle can also be bent back into alignment by pulling or welding. There is no easy adjustments that can be done. It requires someone that is knowledgeable about suspensions and is going to cost money to correct. When you see a price for a wheel alignment, think alignment check. It is going to cost a lot more to correct the problem that caused the alignment to be bad.