indeed they are known as ARB's here in the UK.
Rig, I think you can get quick detatch mounts from inland rovers in the US. Removing them will increase articulation a little, but increase body roll an awefull lot. Most of your lot over the pond have them fitted and then using the quick release mechanism whip them of before hitting back country trails. have a search and a chat with other US landy owners and see what they do. This will give you the best of both worlds.
as a side note, removing the rears makes more difference than the fronts.
G