What factors Determine Tow Rating

Brakes!!! I see everything but better brakes. Higher Hp, bigger tow ratings but no big brake package. Most move up for better brakes, they go to commercial trucks just for the Jake and brake piece of mind.
Bottom line is you are asking a small truck to do the work of a larger. Small brakes do not get rid of heat, nor do radiators or trans coolers in smaller trucks.
If you do not exceed the rating you should be fine but most push it...