That looks like an Iskra motor on a double direction pump and a spring operated directional bleed valve to relieve the pressure on the pump seals. In short, a customised lorry setup.

Easy to use, easy to find, not idiotic in expensive, even new. But limited in pressure. Most of those units have a limit on 175 bar.
And weight is another issue there. That Iskra is a very tough motor, but is heavy compared to the current brushless motors on power output.