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I also disagree with a lot that's been written condemning a rear only ARB, it all comes down to spring/wheel/roll rates and balance.
Oh, and FWIW the old F100/F150's used to use a rear only ARB and they handled ok for what they were.
I fitted a pretty stiff front one to mine purely to try and curtail the massive camber change of a swing front axle.
Sorry if this is going over old ground, but for me, even after reading all the posts, I still cannot understand if the fitting of a rear sway bar will in fact help me.
My misunderstanding stems from when I rock the side of the camper and the camper moves considerably on the suspension, even though i have completely renewed the shocks, springs +25% and fitted air bags on the rear, so what gives?
How will the fitting of a rear sway bar counteract this movement?
gasman, a rear ARB (anti-roll bar) will help in your case, and as Rick said in other cases.
With your camper fitted, it has not only added weight to the rear springs but the C of G (centre of gravity) at the rear is higher than normal. The high rear C of G causes much greater force transfer to the outside rear suspension spring during cornering. A rear ARB will reduce that force transfer, in affect it transfers force from the the more heavily loaded outside spring to the lighter loaded inside spring.
The standard rear ARB is not very stiff, you would be better with a stiffer one. A stock rear ARB is ok without a front ARB, but if you fit a stiffer one, then I would be re-fitting the stock front ARB. Space stock front and rear ARB's down so they don't limit flex.
I don't have personal experience with the x-deflex ARB. I would think they should be stiffer than the stock ARB, by virtue of the larger diameter bar, but I'm lead to believe there is some lost motion in the free-wheel hub that is used to dislocate them. If this was an issue, it wouldn't take much time or effort to swap a standard drive flange for the free-wheel hub for when the camper is fitted. I would think it would be your best bet, but as I said, I don't have personal experience.