I recently purchased a 2017 LX570, I tow a 19' Airstream and use an Anderson WD hitch. I find that the AHC will unload the WD hitch after hitching up. The procedures in the LX manual for hitching are followed, once the engine is started the vehicle adjust to (N) normal height, I re-snug the chains on the hitch, however after driving a while I have found the chains loose. I am going to talk to the dealer about this for a solution, but I am curious to know about other's towing experiences.