Wow, those pics really show just how laid down the rear shocks were! Did they have any working theory behind this? Obviously not a packaging issue. It does have a single rate coil on it. Was there a time before dual rate setups came on the scene? Was this an attempt to to have better compliance on the little stuff?
When I first drove Ellison's, it was running some ridiculous spring rate like -800lb over 900lb for a 10 car package just to maintain ride height. It would blow out the lower trailing arm mount and rod ends...As I remember... it was a style and packageing desire. The first one (bob gordon 's) ran a 4" internal bypass Sway A Way, metering rod shock. As I recall there was some assurance that the design could be made to work. Later variants had a more traditional shock packages and motion ratios.