I am pretty sure you will be way over or weigh over on two or three of the vehicles weight ratings. If you have not done it already you should weigh in when fully loaded for accurate weights. Adding air bags or extra springs will not raise your trucks tow rating but will give it a better ride.
Check the sticker on the door for weight ratings, weigh in and then see where you stand.
Gross Vehicle Weight (GVW)
This is the vehicle's standard curb weight, plus an allowance for a standard amount of luggage, gas and passengers, as predicted by the manufacturer. Of course, your vehicle's actual weight will vary depending on how much luggage, gasoline, and passenger weight you have actually placed in the vehicle, so the GVW is an approximation.
Gross Vehicle Weight Rating (GVWR)
This is the maximum safe actual weight of your vehicle. If you exceed this weight, the vehicle's engine, transmission, brakes, and so on will be stressed beyond their design limits.
Gross Combination Weight (GCW)
This is the actual weight of your vehicle (GVW) plus the actual total weight (not the tongue weight) of your trailer. This number must not be higher than your vehicle's GCWR.
Gross Combination Weight Rating (GCWR)
This is the maximum safe weight of your combined vehicle and trailer. This weight includes all people, luggage, and other material. If your combined towing setup exceeds this weight, your vehicle's engine, transmission, brakes, and so on will be stressed beyond their design limits.
Gross Axle Weight (GAW)
These numbers are the weights expected to be placed on your vehicle's front and rear wheels. The two numbers are likely to be different to account for engine weight and other factors.
Gross Axle Weight Rating (GAWR)
This is the maximum safe weight that can be placed on your front or rear wheels. The two numbers are likely to be different to account for engine weight and trailer tongue weight and luggage. If you exceed this weight rating on either the front or rear tires, you can create a dangerous driving situation or even damage your vehicle.