They are just covering as many scenarios as possible, maybe they have a cattle float or low loader for an excavator, having an HGV is a valuable thing.
Most keepers/farmers will have turned their hand to these jobs at some point, although probably don't have tickets. It's very much jack of all trades nowadays.
I keep banging on at students to highlight their "transferable skills", these skills could easily save an employer £1000s every year.