I bought a 2013 Chevy suburban LTZ 4x4 for the purpose of flat towing it behind my Diesel pusher. I am unable to do this because I was told by a GM dealer that my transfer case is a one speed transfer case and in order to flat tow a Suburban, Yukon or pickups the transfer case must be a two speed transfer case other wise the transfer case can not be put into neutral. My question is what would it take to change this Suburban over so it can be flat towed?