Quote:
Originally Posted by RIC_08TRD_SE
FWIW...
From what I've come to know, class IV hitches are for up to 10K lbs. Above that, a class V hitch is required.
Since our advertised tow capacity is 10,800 lbs, I'd say that make the factory hitch a class V. 
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Well, yes and no...
From Toyota's towing guide page 6.
"
HITCH SELECTION:
Hitches on factory towing packages will correspond to the vehicle’s tow rating. If the truck doesn’t have a hitch, then the following industry guidelines should be observed when selecting one:• Class II: up to 3,500 pounds
• Class III: up to 5,000 pounds
• Class IV: up to 10,000 pounds
These are ratings were defined by the Society of Automotive Engineers some time ago. In recent years, however, full-size
truck manufacturers have set tow ratings beyond 10,000 pounds for their vehicles. Factory tow packages include a hitch subframe
and receiver constructed to match the automaker’s tow rating. The aftermarket has also responded to the increased towing capacity of full-size trucks by either increasing the ratings of their hitches beyond SAE Class IV, or establishing an independent Class V category."