adding towing capabilities to tundra

Hello,

Can anyone tell me what the tow package included on the 2002 Tundra?
Larger radiator? Larger transmission oil cooler? trailer brake pre-wiring? Lower gearing?

I want to add towing capability to my 02 Tundra and want to do right.

Also, I'm thinking of adding limited slip. I think the parts cost around $400 and about $400 to install. Anyone done this? Any comments?