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I believe since this model is so new, you will probably have to go to a U-Haul or tow hitch/truck accessory store to have someone custom mount one on your HS. Probably best to find a Reese or Draw Tite authorized dealer for help.
Where can i find a tow hitch for my hs250? Its for my bike rack not a boat or anything like that
See page 251 of the owner's manual - they say not even for bicycles.
Lexus does not recommend towing a trailer with your vehicle. Lexus also does not recommend the installation of a tow hitch or the use of a tow hitch carrier for a wheelchair, scooter, bicycle, etc. Your vehicle is not designed for trailer towing or for the use of tow hitch mounted carriers.