I've been looking for this exact subject for the past 6 weeks and finally found it. I just bought a 27' 1976 Airstream trailer and it's GVVR is 6200 lbs. mfiver, how heavy is your rig loaded? What type of tow equipment do you have to pull that load? And did you say you didn't have any sway problems? How fast did you go? I was looking at the specs for the Prodigy brake controller http://www.reese-hitches.com/product...HH_39519,90185
and it says that it's not recommended with the X5. Any idea why not? And what exactly is a brake controller? It controls the brake system? That's assuming that the trailer comes with brakes? My AS guy said my trailer only comes with emergency break away brakes. Do I have to buy additional brakes?