| Get the latest issue of Bass and Walleye Boat Magazine (BWB).
their website also has a database with tow ratings for most vehicles.
very handy and informational.
http://www.bwbmag.com/towrating/
here's the example results for my truck:
2002 Ford F-150 4WD SuperCab 5.4L V-8
tow limit: 8600 lbs
Requires automatic transmission, 3.73:1 or 4.10:1 axle ratio. The 3.73:1 is available with 7700 Payload Group A, which includes the necessary equipment (72-amp-hour battery, upgraded radiator, 14-plate auxiliary transmission oil cooler, heavy-duty shock absorbers). The 4.10:1 is available with the 7700 Payload Group B, which includes the necessary equipment (72-amp-hour battery, upgraded radiator, 22-plate auxiliary automatic transmission cooler, and heavy-duty shock absorbers). Group B also includes the Class III trailer towing group, which adds the frame-mounted hitch receiver and 7-pin trailer wiring harness and connector.
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