When the nut gets tight enough, the actuating "wing" on the bolt will ground against the inside of the frame and the bolt will stop turning (per an email I got from Cali Raised LED, which aligns with my experience). You can then torque to spec. You might need a deep socket to make that work...
Since Toyota decided to make the spare tire the lowest part of the vehicle from a departure angle-perspective, I was wondering if anyone found a product to protect the spare's sidewall from abrasion when crossing ditches or scraping over rocks? The only product I have found (HDPE disk that bolts...
I used a torque wrench to get to 18 lb/ft and found that was just over what I was able to get I really cranked on my 15mm ratcheting wrench (~9" long).
I got an aluminum Rival skid, quick shipping and very easy to mount up. It doesn't seem like it would hold up well to dragging over rocks, but should suffice for my needs.
I had a similar issue keeping the bolt from turning with a screwdriver once it started to get fairly tight - but not tight enough that the anchor stopped it from turning - due to the limited space under the vehicle. I bought 2 10mm 1.50 jam nuts and tightened them together at the tip of the bolt...