BainMan is right in first asking what are you planning to tow......weight and trailer type can have some affect on answers as well as your towing conditions such as flatland or mountains, once or twice a year or every weekend, long trips or short ones etc.
If large heavy loads you should make sure you have brakes on the trailer as well as the AV and that if applicable the trailer brake controller is set up well.
Then also consider for heavy loads a weight distribution hitch and of course a transmission oil cooler.