MikeR makes a very nice set of adjustable rear camber arms. Contact him to buy:

https://www.crossfireforum.org/forum...-hardware.html

They will definitely help make the rears last longer. BUT, as James said, reasonable driving will help even more. But what's the fun in that?

What tires are being destroyed? Make? The softer the compound, the quicker they'll go away. There are choices of harder rubber that will last longer at the expense of lower performance.