As mentioned first I'd get everything weighed, not guessed. tongue weight, trailer weight and then make sure the WD hitch is adjusted properly. If you don't get enough weight back to the front end of the truck, the front rises, tires are cambered and what may seem like trailer issues is to light a front end. That was the issue with several friends towing with 1/2 tons and larger trailers. WD hitch was doing almost nothing. Once they got the distribution correct world of difference.
If your trailer is indeed 10K lbs, you should be 1500lbs or more on the tongue. That takes a decent WD hitch setup to get yourself back to where the front of the truck is where it should be. Personally my feeling is air bags aren't doing anything for you other than making it look like your set up correctly, and maybe then even making the situation worse. But that's my opinion on air bags.
If you have it adjusted correctly and are within all the tow ratings, consider something like an equalizer for reese dual cam hitch with a trailer that big.
And I don't think you need a dually. maybe a 3/4 ton,