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Alright, I did some more checking on Fastway's videos on YouTube. Here is their reply on using both the air bags and WDH:
FastwayTrailer
1 month ago
@Craig Werger, a combination of both is a very good setup. The amount of weight you can put on the rear axle is determined by the tow vehicle's rating. Using air bags or a weight distribution hitch does not increase this rating. However, there are also tow ratings for the vehicle, and these are usually higher when using a weight distribution hitch vs. a weight carrying hitch (ball mount). Using a weight distribution hitch correctly should take some weight off the rear axle of the tow vehicle (vs. weight carrying) and force the front axle and trailer axles to carry that weight. You can see this in the video at the 9:12 mark.
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