I have never heard that you must disconnect in the 5er. I tow a smart car and it is suggested that I isolate or disconnect on the smarty because the doors lock after 10 mph. If I have mis-understood the qustion sorry about that.
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2008 MS 4212 2007 Freightliner M2 MountainMaster..2012 Victory Cross Country behind the cab. 2011 Honda Fit pushing the FL and the MS
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