Dtaylor is correct on the stabilizers - you don't want to lift with them at all, only set them to where they are firmly down to the ground. Lifting the body with these, even in a light trailer, can cause damage.
We have a hard side pop-up and I run them down just until the resistance begins to build and then I stop. This results in a camper that does not rock (or tip backwards when you walk to the rear!) but where all of the weight is still on the axle. You will always want to set at least one rear stabilizer on any trailer that is light enough to tip backwards if there was weight aft of the axle (like when your wife walks back there while you are getting setup.)
Your rig is larger enough not to have to deal with that, but the weight issue still applies to the stabilizers...
- Randy