Re: Vehicle DEX
Only for movement.
If it has weapons to fire, chutes to deploy, or anything else of that nature it would to do it per the normal SPD rules, which was the lower of the driver/pilot or the vehicle itself.
For example, a M1A1 battle tank would have a SPD of 2. This duplicates its real life rate of fire for the main gun. So it could fire on phase 6 and 12. However it could move up to 45 mph or around 10" a segment every segment.
In Champions II assuming it had a TURN of 4, it could turn a hexside every 3 segments at its top movement rate.
Meanwhile the top machineguns are mounted outside the armor and thus are not slaved to the turret controls allowing them to be fired at whatever speed the crewman has (the same as any other ground mounted HMG).
Not perfect, but much better than the 5th system.