Rear bump stops -- optional or necessary?

[blacksambo]

Lots of vehicles have these types of travel limiters. Unless I see a link to something showing Isuzu really considered this an "active" part if the suspension, I think you're stretching to make the assumptions you're making.

I totally agree with your assessment on analysis though!

All you have to do is look at the cut-away drawings on the VX JDM brochure to see that the spring helper basically rides on the rear axel to know it had to be an active part of the suspension that was intended curbed body roll.