Air lift 1000?

[chpr1972]

My 66 Lemans conv is lowered to the aprox width of a 4x4 at the front lower frame. I have a slight rake. I need to keep the rear end from lowering any when I add riders or luggage/tools. I have had Monroe air shocks before on another 66 GTO. I need something that will take the weight of 3 heavy people in the back seat and a bunch of tools in trunk. I have Hotchkis 1"rear spring and the spring mount on axle is lowered. 25.5" tall tires. According to the Air Lift and she told me that they do not lift from the top or the bottom but the air bag actually goes between the spring coils. I would think that that would wear the bags out real quick.
My only other option is to raise the rear up more. Since there are big people in my immediate family and speed bumps and drive ways are so inclined any suggestions.