whoever said camber does not wear tires only toe does on the rear does not need to talk, obviously they have no idea.
I own a Mechanic shop in Houston and we specialize in alignments, have been doing alignments since i was 12. 30 as of now
Camber is a slow tire wearing angle that wears tires over time, this is the angle at the top of the wheel which leans inside most of the time, camber sag.
Toe is a fast wearing angle, definitely want to in spec.
Toe is the in or out of the front and rear wheels, people say pigeon toed in or out.
The sliding arms in the rear that adjust toe I have noticed sometimes you can max out the angle but still have negative toe in the rear, to fix this issue I index the trailing arms (Literally take off the wheel and hit the trailing arm with a hammer to keep adjusting toe) I do not recommend this until you have replaced rear suspension components and this is a last option.
inner edge wear is definitely a toe and camber issue.
Negative toe causes inside edge wear
Negative Camber causes inside edge wear.
There are two options to go about fixing this issue.
First option
is to replace suspension components first then get alignment specs, (Expensive)
-Due to age of vehicle no matter how many suspension parts you replace there may be negative camber and toe issues.
-What causes negative camber, weak struts and mounts all the way around, causes camber sag (Negative Camber)
-Also Upper control arm bushings will cause camber sag
The trailing arm bushings on the rear you are talking about will shift if broken out definitely recommend replacing this will throw off the rear toe angles of the vehicle.
Second Option
-Install Adjustable Ball joints w/ Upper control Arms in the front, this will come with control arms and metal bushings, these ball joints slide on the upper control arms, this will help your front camber.
-Rear, Install Upper Adjustable control arms, you can get these off eBay from $30.00 and up depending on which brand
After installing all the parts, call a local alignment shop and explain up front you have adjustable front upper control arms with sliding ball joints, and rear upper control arms that are adjustable. Please be honest and up front with shops, this will help speed up the process of the Alignment. If you do not tell them and just ask for an alignment, they may just set toe and not adjust camber to get your car in and out the shop or they may call and say they can't align today or may go up on price.
Please be honest and up front this will result in the best price and best time frame. Any other Alignment Questions please Shoot, you can Pm me or email me
Autolineofamerica@gmail.com