What are the best heavy duty shocks for the best ride in this truck ?

What is your question?

The air suspension has gone out on my truck for the second time. I know my truck is very old but it's gotta last me just a little while longer. I replace the first air susp. system with one from an after market system from Arnott industries. I was very happy with it's performance until the back one busted or something, Im really not sure what happen. No accident, I don't even drive it that much. And it's just the rear ones. But I can't afford to replace it again at that price esp. if it's gonna last any longer than it did the first time. It's says it has a limited lifetime warranty but with my history with this vehicle something won't go right. It was replaced May 2011. I love the ride of the air suspension that's why I replaced it. Can I get the same ride with a heavy duty shock and should all four be replaced now ????? What brand and how much should they cost ????? I have one more child in college who graduates this May, Praise the LORD !!!!!