On a tanker very similar to your picture we used a Kelvin Hughes instrument for bending moments and sheer forces. I only used a Ralston with a general cargo ship. The loadmaster that Mr Cavo described with the knobs I used on a handy sized bulk carrier. The loading calculator I used on a container vessel was massive, time consuming and expensive. The next ship had a piece of rubbish with a thermal printer.
I then found myself in the fortunate position to recommend a PC based system that was class approved and became standardised throughout the fleet.