For a quick fix until you tear into the truck, consider installing Off Road Design's
Zero Rate Add-a-Leafs. They are a true add-a-leaf in that the center bolt goes thru them. Instant one inch lift for $40 unless you need longer u-bolts. Maybe your u-bolts have one inch of threads left? ORD is near Glenwood Springs/Carbondale.
If you want new, heavy duty springs with a better ride than stock, order customs springs from
Alcan Spring in Grand Junction. They have you weigh the truck empty and then ask what weight loads you want to be able to carry. They'll fab springs to match your truck and anticipated loads. You could drive down for a "fitting." The springs will likely cost more, but they'll ride better than off-the-shelf springs and they'll have many thin leaves with quality features like bolt clamps, diamond cut tips, etc. If money is no object, consider a lift all around.
