It's complicated. Tongue weight isn't only the ability of the hitch to handle the weight. It's also related to the suspension of the vehicle, which is why loads behind the axle in the X technically should be included when you total tongue weight. Keeping that in mind, weight distribution absolutely does reduce load on the rear suspension of the vehicle and transfer a portion to the front suspension/wheels (good) but it creates a dynamic load on the hitch that can exceed the actual hitch rating. That, I believe, is why the Bosal failed on me. With the Equalizer and other torsion bar/spring arm type hitches, the trailer and vehicle attempt to become one solid plank, so going up and down bumps/curbs/etc creates a lot of strain on that connection. This is why it's often recommended to detach the bars on gravel/forest roads. I live on a gravel road and do not engage my bars until I'm at the bottom of the drive.
The ProPride includes a better anti-sway mechanism than the friction type that Equalizer does, which is why I mentioned it. Especially in the case of the X+Airstream, where I am on the lowest tension settings for the Equalizer - friction is at its lowest. The tongue weight problem is just that, though.. something you'd have to manage.
