I have been researching ways to improve my car's "haulability" since my BP  (Hart) makes my SUV 's rear sag a  bit.. Someone here suggested timbrens.. I've read up on them and found some for what seems like a good price to my uneducated eye.. My (probably stupid) question is... Should I get shocks for front and rear?  The company that offers them online has both front and rear shocks.. I was thinking only rear, since that's where my problem lies, but I'm not sure if that's equal to only balancing two tires instead of four..

Thanks for the input

Timbrens are NOT shock absorbers. They are an auxiliary, hard rubber cylindrical "spring", that compresses under weight. Some offer an additional capacity of 6K #'s. They are usually only used in the rear suspensions to eliminate any sagging under heavy loads. Sometimes they are installed in the front end of trucks, that are equipped with a front plow and heavy sub frame. They can be installed, so that they will not effect any ride change while the truck is unladen.

Shock absorbers take out the rebounding of the vehicle's suspension, which causes porpoising or bouncing, uneven tire wear and poor handling. Timbrens add to the weight capacity of the suspension.

 If your truck has many miles, and the body continues to bounce after you've cleared a bump, you may need both shocks and Timbrens; one for the handling, one for additional weight capabilities.

Here's some info: http://www.timbren.com/ses-van-suv.htm

BOL    Gard

The cost of the Timbrens and new shocks/struts, probably would not equal two payments on a new vehicle. Any nice, paid for vehicle that is enjoyed and competent, is worth keeping. Most will easily last 150k-200K with proper maintenance. You're only half way there, and can look forward to more years of less expensive driving. If your rig is doing the job for you now, why change? New and larger = $$$$

BOL   Gard