1 - On my Thor Palazzo I always level the coach with the engine running first, then I turn off the engine and extend the slides. It would put too much load on the slides to jerk them around in the extended position while running the levelling jacks.
2 - My Lippert manual and several techs tell me to hold the switch down after retracting or extending slides to allow the mechanism to synchronize. It does not stress the motors to do so as their is a circuit that cuts off the motor after synching.
3 - On my coach it is possible to start the motor and adjust the levelers with the slides extended. The only time I have done so was when my slide gear mechanism broke while the slide was extended. I tipped the coach so that gravity assisted with manually closing the slide.
4 - Consider finding a new service adviser.
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