The tag in the drivers door should have your axle weight ratings as well as your Gross Vehicle Weight Rating (GVWR). This is the best way to check out a vehicle for your needs.
Your air bag pressure is not really letting you know how much weight you have sitting on the axle and tires.
There is an onboard scale system available (Log Trucks use them a lot since there is no scale in the woods.). It is a block of material that is placed between the log bunks and the frame of the truck. As weight is applied it sends an electrical signal to the computer which has been calibrated when the system was installed to read out actual weight of the vehicle as well as the weight added to the vehicle.
Personally I like two drive axles for purposes of traction when needed, I know the suspension and tires are going to handle anything I throw at it and last...Go big or stay home!!
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