SabJKU -- how long have you had your awning mounted on Thule system? And any problems?
The reason I ask is that since the JKU roof (including rain gutters) is fibreglass, I'd be worried about the strength. When I was shopping for a rack a few years back I saw that Thule and other rack manufactures sell products for the JK but they have very conservative load estimates, and I was advised that that the fibreglass roofs on the JK are prone to cracking with the stresses of off road. Thule's system states it's max load is 75 kgs, but also states that it depends on the vehicle. If you have an awning weighing in at 50 lbs you are of course well below that, but that is a static load not a dynamic one and I've never found info on those gutter mount racks either way. My fear is that a 50 lbs load can easily put stresses well beyond 165 lbs (75 kgs) on a rough road at speed.
Of course, everyone's mileage may vary and this will work for lots of people just fine but I thought it would be good to hear your experience so far.
For comparison though, the Gobi rack that I went with has a 150 dynamic, 300 static rating so it's not all that much better than the Thule, but the mounts are to the windshield bracket (part of the roll bar structure) and the rear frame so I think it's probably pretty robust for heavier weights.
Very good question, and concern. I myself did a lot of research surrounding this before making my decision. I really didn't want to drill into my hardtop and do any modifications inside the vehicle to run an awning, if it was avoidable. I found a number of other folks on a few other forums that were also running the Thule square load bars and gutter mounts with Foxwing or ARB awnings, and they confirmed no problems.
It's probably been close to a year or so now with the Thule gutter mount and ARB awning on my JKU. I haven't used it for anything else other than sliding my kayak on top of the load bars and strapping that down.(My kayak is only 38lbs though). I've had zero problems. I drive a few hundred miles each weekend and do a lot of fireroads, forestroads, etc, and very minor "4wd" trails, but have seen no signs of any fatigue, cracks, slippage, etc. I also commute every day in my Jeep, about 50 miles round trip, and see hwy speeds most of the time around 60-70mph(except for rush hour in DC!
) The roads around here are not always the smoothest either, so there is a bit of a beating that gets exerted on the setup. Again, zero issues. I wouldn't have a problem recommending this setup at all.