Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Toyota for this TSB. Call your local Toyota dealer's service department & ask for a copy of TSB# 980603980603.
Affected Component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE
DURING INSTALLATION THE SELF TAPPING SCREWS, PLACED IN THE TRAILER HITCH CROSS TUBE TO ATTACH THE WIRE HARNESS BRACKET REQUIRE LUBRICANT TO PREVENT BREAKING. *YC