Hi,
I have been told to re-check the lug nuts after 50 miles towing after the wheel has been removed. My guess is that most owners never check the lug nuts - the better informed members of this board excepted.
My guess is some lawyer required the manufacture to put that statement into the owner manual after someone's tire fell off causing a accident.
U-Haul had a problem with it's 75 - 79 F-350 dual rear wheel trucks where overtightening of the lug nuts caused them to pull through the brake drum mounts, and basically fall off. By torquing them to the correct value, the problem went away.
Fred.