@RayTech

Well, I don't know what are the standards prescribed in your contract with the customer, but for me it's hard to imagine how to make a proper inspection in accordance to manufacturer requirements within such rate.
In 6000 hours you must replace at least 12 times engine oil, fuel (ev LPG) filters, 3 times hydraulics filters (usually expensive)+ oil, on some trucks transmission filters, 6 times air filters, belts, etc.
Plus a lot of checking, lubricating, testing.
For an average IC truck, properly made inspection takes 2 to 6 hours of labour.
For electric trucks it takes less time, but it's pretty much work to do either.
I can only imagine such rates for the simple pedestrian controlled trucks.