Are there any tricks to towing a trailer?

I have a 1995 GMC Yukon GT with a 350 TBI engine. I am towing a trailer full of shingle debris to the dump for my father-in-law. Should I do anything to prepare the truck like inflate the tires to max pressure? Also, should I drive in 4-wheel drive with a loaded trailer or does it really matter? I appreciate your help, this is my first time towing anything!