I think you have to pick them up at a dealer.
Smartcap is very specific on the bolt torque. My old torque wrench wouldn't go down low enough. This is the wrench I used:
https://www.amazon.com/dp/B0D1Y5V21L?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_4&th=1
Clever comment.
So, I didn't buy one because they're expensive. Perhaps that's on your menu, but not mine.
I put money down on an allocation in June, and as soon as I had the final VIN, I ordered a Leer. I picked up my truck in early August, and eight weeks later, I called the Leer dealer and...
My experience in the middle of Idaho is that the system works as well as expected. You still have to drive the vehicle, slow down, etc. It isn't going to react to the rear end breaking loose.
One of my latches quit working. I contacted Smartcap, and they said they had a bad batch. They are sending six of the old-style latches and will replace them with upgraded new-style latches when they become available.