Does this mean that having solid front and rear axles will incur a $1.5k AMU rebate (subtracted from the car’s base price), even if the rear solid axle is coil-sprung? I’m sure it does.
In any case, you’re making the right decision in making every rear suspension type other than a leaf-sprung solid rear axle an extra-cost option (whose cost will be added to the car’s base price) for balancing reasons. However, given that a 4x4 drivetrain behaves identically to a RWD one when not engaged, it’s not surprising that it isn’t a no-cost option, whereas an AWD system is.
Also, I’m sure that “standard unleaded” refers to regular (91RON/87AKI) unleaded, and the wheelbase rounding refers to the nearest 0.1m.
Anyway, this is reminiscent of what JOC6C would’ve looked like if it were set in 1990.