I towed an E2 and new tow an E4 with a reese 1200lb round bar WDH, I have never had and sway and it works even with my harley on the deck of the E4. I highly recommend it.
JCH
New TV: 2008 Dodge Ram 3500, 6.7L Cummins, 6 Speed Auto, No mods yet (but they are coming)
2008 Fleetwood Evolution E-4, Reese Round Bar Weight Distributing Hitch
Me and the Wife: Scuba Dive, Mountain Bike, Kayak, Hike
Two Dogs: Mako and Amber
Just make sure your PUP actually can use a WDH. The manual for our Flagstaff specifically says that you cannot use a WDH or else you can bend the frame all up. Not good. So check your manual or with the manufacturer directly to make sure that you can use one. Never trust the dealer.
Also check to make sure that your TV can take a WDH. Some cannot. I don't think you'd have a problem with yours but it's good to be safe and check.
Personally what I did was added airbags to the rear shocks and it eliminated any sag I had (and only cost me about $100 installed). But like I said, I can't use a WDH with my PUP. Sway is no problem at all either so I can get away with neither a WDH or a sway bar, just the air bags.
Thanks for the replies, I will check with the dealer to find out which one they wanted to add on. I also have adjustable shocks which I can control to help with the load. I don't want to buy one only to find out it will not work for my PUP.
I pulled the PUP out and set everything up, glad I did, would not want to try that for the first time when I arrived at the campground. Am excited about my upcoming trips. I may even take it out for an overnight trip in the local mountains mid of next week when the kid is out of school, just to get a little more experience...