This large nut was laying on the ground next to my Rover (shared parking lot so it could have come from somewhere else). It is roughly the size of the nuts that bolt on the control arms but I am not missing any of those. Does anybody know if this nut came off of an LR3?

 

Does not look LR related to me at all.

 

That's pretty funny. I agree that it doesn't look like a Land Rover nut at all, and I'm not aware of any LR hardware that requires that kind of a torque spec. The good news is that if it did fall off your truck, you're probably going to find out that it's missing very, very quickly.