When we towed a lot, I made the decision to tow 4-down, which for us worked out just fine. As far as towed miles showing on the odometer, with a GM car, you pull a fuse (I wired a switch in to do that) that disconnects all accessories, the SRS system and the odometer, so you do not log miles while towing. That's important, if for nothing else, warrantee purposes. IMO towing 4-down, just presents one less thing to have to deal with. I like things simple!
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