I have a 98 Sport 4.0 SOHC, i use it to tow a boat quite often in the summer....
For towing you deffinetally want a good shock, but i get the assumption you dont like the stiff ride of off-road shocks.
I ASSUME any good shock would work fine, but my suggestion is rancho9000x shocks. I say that because everyone i have talked to speaks very highly of them. I bought them.
With those shocks you can adjust the stiffness. Put the rear shocks on setting #9 while you're towing for better respones; and them change them back to #1 or 2 when you're driving on the highway for a nice smooth ride. You can put those shocks in the rear and other shocks up front- i guess that'll suit your needs pretty well.
I bought mine from Hot-rodOffroad.com
They were $67 a piece.... came to $74 each after shipping to NJ.
Hope i helped!
BTW- VERY EASY to install yourself
