A website devoted to trailer boats has a nice searchable database for trailer towing information, based on truck brand, model, model year, etc.

Go to www.trailerboat.com; once there, click on the tab at the top of the page that references the trailer towing database.

The database covers the newer model years, and I believe it goes back to 1991 model years, or it will soon. This is a good adjunct to the information Raoul has put together in his "sticky" chart!

 

The link is www.trailerboats.com without the semicolon at the end.