The 5100 have adjustable ride height spring perch's, that the lowest setting will still give a 3/4" lift. So that increases your additional lift even more and might throw off the "level" of the vehicle.
The Commander has Independent Front Suspension, so there is very little, if anything, to gain from longer/greater travel struts/shocks on the front.
I have the Bilstien 4600 front shocks. They are firmer than the OEM, or at least that is my perception after replacing worn out shocks, so I might be wrong.
Off road you'd probably want softer and NOT firmer, but even that varies according to exactly what you're doing. Its a good shock, and NOT so different than OEM that I'm sure it will work as well off-road as well.
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