Interesting.
I stood around and watched my indy LR guy drop the tank to replace the cracked locking ring.
IIRC, he had the tank down in less than 15 minutes, without issue.
Granted, this was on a 2 post lift, with a transmission jack to support the tank, but I don't recall anything else needing to come out to get the tank down, other than the TR gas tank skid plate that I have.
He dropped the tank, we figured out what parts were needed (locking ring and gasket), I took another shop vehicle and ran to the local dealer and bought the parts, came back, and he had it back together again in short order.
IDK, Maybe something changed from the LR3 to LR4 configuration, but I don't recall thinking it would have been a big deal to do myself, other than not having a way to support the tank at home.