That's a very nice setup, but the friction sway bar is as simple as an anvil, and you don't have to do weekly gym workouts to wrestle with all the hardware associated with the conventional load leveling and sway components. Yes, some vehicle and trailer setups just about require the more complex setup because of tongue weight, overall length, weak truck springs, and other issues. However, if you have a decent trailer tongue weight, an airbag or other suspension aid, and a well balanced tow package, this expense and heavy hardware is not needed. I've towed a 27" travel trailer and other towed items all over the western U.S. at high speeds in all kinds of windy and otherwise detrimental conditions with just airbags and a simple friction sway bar. It was very safe, and the trailer hookup and unhook takes a few seconds with no worry about stowage of the more complex hardware.
Now look...I'm not suggesting that people push the envelope with extremely heavy towing packages by shunning load leveling and more complex sway devices when they're truly needed. My travel trailer weighs just a hair over 5000 pounds when loaded and has a well balanced tongue weight. The friction sway bar does just fine and is safe. I pulled this trailer with an '89 full size GMC Jimmy 4X4 that was lifted. This vehicle had a super short 106" wheelbase with suspension assisted airbags and a simple friction sway device. Neither semi trucks at highway speed nor high winds upset this package. You just have know what you're dealing with when it comes to overall weight, weight balance, and the capability of your tow vehicle. I used my parent's load leveling setup on their truck and trailer setup one time some years ago, and it was a PITA in comparison to mine. If you need that setup because of the factors I already mentioned, then by all means use it. Safety first. I'm just saying this is often an overrated issue for all towing situations.