We use TLD Driveable steps which do reduce Manual Handling issues but I wouldnt say they reduce Aircraft Damage.
They are more stable than Towable steps due to the heavy stabilizer system fitted to them.
The issue I find with driveable steps is the fact that the operative have a habit of leaving the Passenger guide steps on with the steps switched off which of course kills the battery...
Due to operating in a hot country we could not have operatives hand pumping steps to different heights etc.
I alway used Towable steps in UK and although it was a pain (especially in high winds) to raise/lower the steps I prefered them. The company could afford to purchase more steps and therefore made it easier to service A/C...
Hope this helps...