As an attorney I don't believe not having is "against the law" everywhere but it my be prohibited in some jurisdictions.
The R-POD was such a little thing the dealer advised that he didn't think we really need one with the LR3. Then again the dealer was in Ohio.
Since the 21 FBRS is "bigger" I thought it was a good idea since it was included in the buy with installation, which took all of an hour.
This dealer was in LA.
With dual axles I like the way it works and I feel more comfortable in the event of an emergency stop - especially downhill!