If you feel like you need it, just get the extra sway. Theres apparently plenty of heroes here that say you don't need any on their half ton trucks, and call me a wimp but whatever.
Back when I had my 30' TT being towed by my dually diesel, it wasn't too bad as long as I was going down a 2 lane country road on a calm day. Get on the interstate with trucks passing you, or get some crosswinds it made for a white knuckle ride at times.. No amount of mirror checking does any good when crossing a long bridge and you get a nice 25-30mph cross gust and the thing starts flopping around. I was constantly hitting the lever on the brake controller to get the trailer to settle down...
Thats in a 8000lb truck with the added track width of a dually, pulling a 5500lb 30' TT... If some of you want to pull a 5-6000lb camper with a 6500lb truck and no sway control have at it, I just hope when it goes out of control you don't take any innocent people in other vehicles with you.