I wouldn't remove them,if you do the axle can hit frame....beside hurting your back and kidneys it wouldn't be good for axle tubes.
once springs after 20 years get soft the truck sits on the bumpstops most of the time eventually ribbing them and then tearing them off the frame.
There are two styles solid and with holes in them.....solid ride ruffer so isuzu put holes in them so they wouldn't hit so hard
The rear bumpstops were missing when I bought my Trooper, so I ran without them for a while. But the tires were eating the fenders off-road, so I got some OEM bumpstops from Jerry Lemond, helped a lot with that.