Muddy Fox Interactive...
The 1948 2CV featured:
four wheel independent suspension that was inter-connected front to rear on the same side,
The inter-connection transmitted some of the force deflecting a front wheel up over a bump, to push the rear wheel down on the same side. When the rear wheel met that bump a moment later, it did the same in reverse, keeping the car level front to rear. This made the suspension more responsive, enabling the 2CV to indeed be driven at speed over a ploughed field
...has two wheel non-independent suspension that is inter-connected front to rear with both wheels sharing the same spring....
...The interconnection transmits all of the force deflecting a front wheel up over a bump, to push the rear wheel up at the same time. When the rear wheel meets that bump, it does the same in reverse, making the bike behave like an unsprung bike but less harsh. This made the suspension less responsive to braking and pedelling forces, enabling the Muddy Fox Interactive to be more efficient than other suspension bikes of its day.
I have never ridden an 'Interactive' but have some magazine articles (New Cyclist) on the Dave Smart roadbikes that preceded it. It's a very 'latteral', 'outside of the box' way of making an energy efficient suspension bike. Most other designs use stiff springs, lockouts or simply pretend that suspension bikes don't have efficiency issues.
In theory it should work especially if you pre-load the spring. Though it should squat slightly under heavy braking. The downside is that its suspension is not independent.
people who have ridden an Interactive, please let me know if I'am talking rubbish about its charactaristics.
The 1955 Citroen DS used hydrallics for its interconnection: Semi-independent, adjustable, and lightweight. Now there's an idea for a project.