As far as hauling loads...

The shackles will leave you with exactly the same capacity as stock.

The AAL's will temporarily increase your capacity, but, you will sag them, and no longer have the same amount of lift, if you keep hauling more than the susspension was designed for (The AAL's are supposed to provide height, that's it)

So - The stock leaves will also sag under that kind of loading, and the AAL's might prolong their life under those conditions.

The X has a mere 750 lb or so of extra cargo capacity...so tongue weights are a better bet than actual cargo loading, if you have a lot to haul/want your suspension to last.