rear shocks

what's this hardest stiffest shock absorbers I could buy for the rear of a 93 dodge caravan so the back doesn't sag under heavy loads?
And where is the diagnostic link connector to check codes with a scan tool?

if you want something to hold the car up, you buy springs, not shocks

what's this hardest stiffest shock absorbers I could buy for the rear of a 93 dodge caravan so the back doesn't sag under heavy loads?
And where is the diagnostic link connector to check codes with a scan tool?

The link connector is located under the dash near the sterring column
You can install air shocks to stiffin your suspension.
http://www.shockwarehouse.com/cgi-bin/shocks/mon_air.html

Shocks (also known as dampeners, in some circles) dampen the movement of the spring, they do not support any weight. You can get air shocks, at that point they are not as much a shock as they are a air spring. They still call them shocks b/c the air in the shocks is chaneled through small holes in order to slow movement of the suspension. For the most part they don't perform their shock duty very well and the ride quality suffers. In order to have any shock value you need to keep 25 to 40psi of pressure in them. Unfortunately the pressure also "jacks up" the rear end and causes problems when there is no load to hold it down.

Check out my post on sagging rear end on my 95 T&C. This worked for me!

On new vehicles they actually do have shocks that boost up the rear end under heavy loads . They are called nivomats and they cost like $400 a piece . I doubt you can retrofit them though , think they are specially made to fit particular vehicles . I have them on our 2004 T&C , they are part of the tow package . Not looking forward to replacing those down the road . They look like they belong on the full size pickup , they are HUGE!!! These are not air shocks either , they are special hydraulic shocks that basically pump themselves up under load after driving down the road for say a mile or 2 .