I hafta agree with Dub & Swede (Did I REALLY just say that out loud???).

It doesn't matter what you call those rubber donuts. It doesn't matter what Isuzu calls them. They serve the sole purpose of STOPPING suspension travel (in a bone jarring, blood pissing manner). If they are engaging whilst driving on road, you have something wrong with your suspension (design defect or worn parts). They should NOT play a part in helping with on road body roll.

If you only have a fraction of an inch of distance between the bump stop & the axle housing ... & you don't want to cut the stop, then you should be seriously considering replacement coils (either OEM or aftermarket). Coil springs do have a tendancy to sag with time & use (lets see, I'll set 1000 lbs on this here coil spring & let it sit for 13 years ... I wonder if the spring will deform???)

Or better yet - do like Mav did & add an airbag inside the coil ... infinitely adjustable & air makes a nice cushy ride!!!