Electric retracts (screw jacks) all the way!
Electron and lado cater for the big stuff, and even have an EMF braking system (no air required)!
There is however, an on board compressor being developed by JetTronics!
This would cater better for pneumatics than Co2 being pumped directly into the system!
It would cause long term damage to the seals in the valve gear and retracts! It has never been an option in industry, due to icing (the seals crumble and split)![&o]

JT