JRM,
A good set of air shocks would level things out for you. the owner before you probably towed some heavy gear with it unless you do. i have a set of Gabriel air shocks they work great when i hook up my trailer, or when im just riding. im looking into the Rancho 9000's with the in cab switch board deal. i think the air shocks are the cheapest way around this problem. wait till you get more info on it though. maybe some one has a better plan/idea.
Later
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1991 Eddie Bauer 4x4
K&N drop in filter, Modified air box.
3" lift 31x10.50's
Dunlop R/V's.
Sway bar quick disconects disc.http://www.freeyellow.com/members8/91fordexplorer/index.html