Well Camburg is plenty durable. For the rear, Camburg suggests Deaver springs. They are a softer spring but they lift the truck. They're designed for longer travel. If you aren't concerned with travel that much, Skyjacker has replacement leaf springs with 6" of lift which should be about level.
Camburg's website is down at the moment, but look on the page posted and toward the bottom you'll see the Deaver springs.