Towing and rear suspension opinions needed

[squirel]

I am building a 67 short fleet. My plans are to use this truck for weekend cruising and pulling my holiday trailer. It is not lowered and has the coil spring rear end with a 12 bolt. The problem is the hitch weight of the trailer is 950 pounds and the dry weight is 7337 pounds. Will 3/4 tons springs be enough? I have looked at the helper air bags that fit inside the springs ( http://www.jcwhitney.com/1000-adjust.../p2005927.jcwx ) they do not make them for our trucks that I can find. Or do I ditch the springs for air bags ( http://www.airbagit.com/product-p/fbx-r-che-02.htm ) Or is there a different option any opinions would be appreciated. Thanks