I finally got the RAS installed on Saturday. But first a side note about dealing with Nissan.

I thought I would go ahead and call them to see if, first, there were any warranty problems with putting this on, and second to see if they might do something about it.

They took the X for a drive, but said they didn't see a problem. But said they didn't have a few hundred lbs to put in the back.(by the way, according to the sticker on the door, this X has a payload of 930lbs).
So they would not do anything about it, and even if they did, they could only put OEM springs on it anyway.

On the warranty issue, they said that technically, it could void my warranty on the suspension. However, and this is not in writing, but... the Service Manager said it shouldn't be a problem and he knows of others putting similar devices on their X without problems or voiding the warranty.

So back to the RAS. I did have one problem that RAS says doesn't happen often. With the bracket installed with the leaf spring, the u-bolts were then too short to reattach. So I had to go find longer u-bolts, which was a pain on a saturday.

But I finally got everything put back together, which only took about 2 hours of actual work time (not counting the search for u-bolts), and the vehicle does ride very nicely. I put about 450 lbs in the back and it rides much better and is more solid in the back.

As for the other claims for the RAS I can't say yet, but it did increase my payload dramatically.

So that's the story so far.

Andy