Okay, I know this is going to raise some hackles. But every time I read 'Airbags or springs etc to fix rear sag" I groan.
Humor me people and check these couple of tidbits from the interweb.
1. Do airbags replace weight distribution hitch?
No. WD hitches actually lift weight off of the rear axle to transfer it to the front axle and trailer axles. Airbags leave all of that weight on the rear axle, and just push the rear of the tow vehicle up.Jan 1, 2019
2. Do you need weight distribution hitch with air suspension?
Airbags cannot distribute the weight from the rear axle, so a weight distribution hitch is recommended for a safer journey, even with an airbag system.
3. Like an airbag, a WDH will raise back of the tow vehicle, reducing some of the sag caused by the trailer's tongue weight. But the way a WDH raises the rear of the truck is key –
it uses torsion to shift a percentage of the tongue weight to the front axle of the tow vehicle.
Also. This design
shifts 20%-30% of the tongue weight back onto the trailer tongue, which transfers it back onto the trailer's axle. This setup helps create more even weight distribution throughout the entire setup.
And finally, 13 minutes of your time may keep you from Flaming me
Fastway engineers Jason Harper and Matt Barnes investigate the difference between using either a rear axle air bag system, or a weight distribution hitch to ...
youtu.be
Have fun.