I've got a '98 Vectra with HWH 610 Series jacks. Probably not the same as yours but the Operators Manual I have has very brief instructions.
Essentially you level the coach, then adjust one, or more, of the 3 sensing unit mounting screws until all yellow lights are off. The drawing shows springs around these screws but does not say where the unit is located.
I'd call HWH. From everything I've read on this forum, they are eager to help you.
pete
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Pete - Full Timing
2000 Country Coach Magna 40', CAT C10, #5892
2006 Jeep Liberty
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