Installing Trailor Brake Controler Box: Anyone Done This On A 00' Tacoma Sr5?

I Have Heard That You Have To Have A Special Interface Box Or Something To Wire In The Brake Controler On The Toyotas, Something About The Ground System? Not Sure Just Wanted To See If Anyone Has Done This Yet. I Will Be Installing The Brake Controler And Wiring Hookups "in Rear" For The Flat And Large Round Style Trailor Hookups. Any Information Would Be Appreciated!