I'm a little late to the party, but will add my 2 cents (exactly what it's worth).

I tow a 20' enclosed trailer that, when loaded, comes in at about 7000lbs. With a proper weight distribution setup, it pulls pretty good. The weight distribution can actually help with the sway as well, but it can get a little hairy from time to time.

I also use the P3 controller - works great. I got the mopar brake controller harness which made the install even easier - plug-n-play! Why this wasn't included with the towing prep package I have no idea.

I bought my stuff from etrailer.com for probably about $500 total.