33' unless it's a really light TT is too long for your EX.
The longer the TT the more side surface to catch wind and if it's heavy that will only add to sway with the EX.
Just because Ford says the Ex can tow 9200 lbs doesn't mean you'd want to. Normally most tow ,much lighter TT's than what their tow vehicle is rated for.
You don't mention the weight of the TT's. IMo you shouldn't go over 6,000 lbs loaded with the EX. Go short with 25'-28' max.
Check the payload rating on the door jamb. Make sure the tongue weight is 12%+