There are folks more experienced with lift kits than myself on this forum, take their word over mine.
But, a 4" in lift in a Commander with Independent Front Suspension, to do it properly, is going to require replacement of major suspension pieces. The kits I have seen (and Don't know the Brand) have replacement steering knuckles that are elongated and move the hub placement.
If this kit just uses blocks or longer springs to just increase the distance between the suspension and the body, keeping all the same suspension geometry, at 4" it will likely put drive shafts and tie-rods, maybe even ball joints, near their limits for angles. Which could mean lots of broken or worn out parts in your future, and perhaps poor handling. (I could be wrong, but I'm confident at 4" you had better make sure its a "quality" kit doing the lift "right" or you could regret it).
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