Just for your information David, the anti-roll bar in a monoshock suspension is the part marked in
orange:
The anti-roll strength is determined by how much this bar resists twisting (
blue arrows, twisting in a direction depending on which wheel tries to move upwards).
If both both left and right suspension move equally, there is no twisting and only spring and damper influence the wheel's vertical movement. In this case the whole T-shaped segment moves back and forth (
green arrow), compressing the spring.
If for example only the right wheel drives over a kerb and is thus pushed up, the triangle part rotates counter-clockwise (it rotates around the green part which is where it's mounted), pushing the damper rod and pulling on the spring rod. Since only the right wheel tries to move up, the anti-roll bar now has to twist clockwise to allow (or not allow) this to happen.
Obviously this means if LFS tries to simulate a monoshock suspension (front susp. of FBM for example) the ARB should have a very limited adjustability and be rather strong in general, which isn't the case at the moment. Though this should be fixable very easily with simple setup restrictions in the future.