I have never heard mine even with the spare wheel cover removed. May be you have a slow leak. I tow a trailer around a fair bit with various loads, the car always sits level, I never hear the compressor.
And Yes I do have SLS.
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Cheers Andy
From Down under
2004 4.4i Sport Alpine White
2008 Toyota Land Cruiser Turbo Diesel (on order)
1993 Daihatsu Feroza SXP II
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