Do I neeed it the air bag helper suspension.......

Just a heads up.You need to add line breaks and paraphrase / paragraph your post it is hard to follow as is.
You will get better responses if people can read your post. It reads like one long rambling sentence.
You need to go to the scales and get some real world weights. You also need to determine if the sagging is impacting your headlights. Some sagging is to be expected. However if your headlights are now pointing upward you need to take action.