I searched on “towing with a 4 cylinder” and found this on the first page of 7. There might be other threads there. https://tab-rv.vanillacommunity.com/discussion/7156/towing-with-ford-ranger-4-cylin… (View Post)
In case you haven’t done so already, there’re 2 manuals for the 400 in the User Manuals/PDF files category in the left hand category column. Reading those might inform your dealer walk through questi… (View Post)