How do you adjust (load) the rear suspension using aribags? Is it just a process of launching over-and-over and making changes? Also, what does it take to install these (labor wise).

 

Abjustment is by filling the bag with more air to make it harder. A single air bag is used on the passenger side rear spring, it fits inside the spring. Installation is easy, raise the rear and lower the rear end to take th spring out, put the bag in and you're done.

 

How do I know when I've put enough air in (trial and error I guess)? What do I have to do to lower the rear axle?

 

Yes, testing is the only way to see how your car reacts.
I am currently running 15 psi in the air bag, it hooks good but I need to try 18 to 20 or so and see how that works.
The rear can be dropped by putting jackstands under the frame in the rear and then using your floor jack to slowly let the rear come down, don,t let the rear go too far down.