The Weight Court says you are guilty !!! (Of taking the time to weigh your rig and set it up correctly !!)
IMHO, you need to transfer more weight to the front truck axle. You are currently still missing 320 lbs. of weight on the front TV axle. 1 or 2 more more washers in the Equal-i-zer may correct that problem.
Once you do that, more weight will be transferred to the trailer axles, leaving a bit more weight available for the truck. It would probably be wise to still not carry much in the truck except your passengers.
The 1200 lb. spring bars may be needed, but maybe some of the resident Equal-i-zer experts can chime in on that.
Once you get the proper setup, there should be no need for airbags. (IMHO, airbags should not be used on a 1/2 ton truck.....it encourages people to overload their rear axles.)
As far as the beer weight.....with a 14% tongue weight (which is not bad), you can load up the beer near the rear of the trailer without worries.
Kudos for trying to get the best possible performance and safety from your combo, but always keep in mind that is a lot of trailer for a 1/2 ton truck, so drive safe out there.