Air shocks?

I've got Airshocks on the back of quite a few of my vehicles. They're actually designed for Load Leveling (like some others mentioned), for Trucks and such. Not really for "Raking" a car, but they do that pretty well if you keep the pressure set low (some rake without a harsh ride)

The Airshocks on the back of my '73 340 Duster have been on there since the 70's, when my dad installed em. They're set at 60psi.

Have airshocks on the back of my 74 too, slapped em on in 2006 I believe. The Airshocks on my '74 have a regular shock inside them as well, I can air em down completely and they'll function as a regular shock. Not sure who made em, they're pretty old (they were installed on my '73 340 Dart Sport when I bought it about 15 years ago)

Once I cranked the Airshocks on my '73 Duster up to 150psi... My D50 was broke down (radiator, fan and a few other things) and I needed some cash to buy parts for it. So I pulled the '73 Duster in front of the shop, maxed the pressure on the Airshocks and then proceeded to load 800 pounds worth of Car Batteries, Aluminum and Stainless Steel in the trunk and hauled the stuff to the Recycling Center with a 340 Duster :D

Every time I hit a small bump or went around a turn, those 29x14.5-14" Rear Tires would howl against the Tubs & Quarter Panels.