[rohrmann]

I've had the rig totally lifted off the ground with all the jacks for as long as four days years ago, and service the brakes/bearings many times using the jacks. Have also raised the wheels off the ground for tire replacements at a tire dealer, while traveling and still connected to the truck, and have not had any issues. I find that raising both sides at the same time eliminates putting the rig so far off level that the system locks out, and that has worked many times. You just use the REAR button and all the center and rear jacks will raise the rig.