I agree Adam, was the Michael the give away?
Having looked closer at the piccies I have my doubts if the stablisers were even used. Looking at the first piccy the weight of the Hiab is making the lorry lean, before they even lift anything.
Because he has took that Hiab below the horizontal it lifts in an arc, as you lift the weight moves further from the truck(when wrongly used) and the weight increases. If you use a crane or heavy recovery truck this doesn't happen.
Real shame though, these guy's probably struggle in remote area's to make a living and this has cost minimum £20K even if the trucks getting on a bit. Hopefully nobody was hurt.
BTW, mmj the water and capillary action can easily double the weight.