Coolers for multi-socket

Multi-socket motherboards have been in the public arena for over 8 years now, but every heatsink review is based around the mono socket board.
Some may think that all heatsinks will work in all situations, but there is one thing that separates the field.

Weight.

Some of the highend coolers are weighing in at over 700 grams, some more.
On a dual socket that is one and a half kilos (3 pounds) per socket.
So a 4 socket board could easily end up with 12 pounds hanging off it.

In these reviews we see the motherboard sitting flat, they may stand the case up for a photo.
I'd like to see what damage may occur on moving one of these beasts around like may occur with the LAN Party crowd, or just getting your machine on and off the shelf during maintenance periods etc.
What damage is done to the 8 layer PCB, how much abuse/ movement can be done before things break.
The first should be the 12 pound scenario or 24 pound on an 8-socket beast.