STAN
Fantastic to actually see one! It totalled the oleo weights and gave a c of g estimate. On the Merchantman (VC9 or converted Vickers Vanguard for those without a memory as long as mine), it was a very rough cross-check. There were no known limits which had to be observed and it was, in my view, mostly psychological. If it did not match, even roughly, your own T/O weight estimate and the load sheet weight, then you probably had a problem. The c of g was supposed (IIRC) to be roughly within 4% of calculated. That certainly saved my life on one occasion. But most importantly, what it do do, was make you have your own estimate of the T/O weight in mind.
Can you force someone out of complacency? Well, this went some of the way.