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I purchased my first 4WD truck in February (2020 GMC Sierra 1500 4WD 6.2L 2 speed Transfer Case). I wasn't really in the market for a 4WD model, but had to choose one to get the options I did want. So I am unfamiliar with the proper use of 4WD. Specifically: 1) When just driving around town and not towing anything, should I leave the transfer case setting set to 2WD or 'Auto?' 2) The manual recommends not using a automatic carwash without giving a reason. Is there a real 'danger' in using one leaving aside the need to choose one that can handle the size of the truck (I've read the posts about leaks, but that is a different issue for me)? 3) My research suggests that if I were to have the truck towed or pulled through a carwash by rollers behind the front wheels that I should put both the transmission and transfer case in neutral. Is that correct? Anything else I should do (besides turn off the auto windshield wipers setting and keep my foot off the brake)? I did search this forum (and the Internet) trying to find the the answers to these questions, so if I missed something, please forward a link. TIA