WHen replacing the RTAB's, where should the car be jacked up from (Does the suspension need to be supported by a jack stand)? Does the suspension need to be relaxed or compressed to drop the trailing arm and remove the bushing?

TIA

you should be able to lift the vehicle up from the lift points on the rear. Make sure you are not obstucting the trailing arms with the jack stands. It doesn't "need" to be compressed.
BE SURE YOU CHOCK THE FRONT TIRES, BECAUSE ONCE THE REAR TIRES ARE OFF THE GROUND THERE IS NOTHING HOLDING THE VEHICLE IN PLACE.....PLEASE BE SURE OF THIS STEP.
The bushings are fairly easy as long as you have the correct special tools.

I always chock the wheels (military taught me that) when I lift a vehicle. Thanks for the input. special tools list:

Sawzall
Drill


Check!! Replacing with poly bushings

not to bad of a job. Especially with those special tools you got there. haha