When I first bought my first new RV, I have to park it on the grass before the parking for the RV was put in.
When parking on the grass, the wheels sink a little into the soft ground which makes the steps not fully extended. I was very much worried at the time. But after the parking space is available, the steps seems working fine, and yes, mine was also very low to the ground, 5" from the bottom of the lowest step to the ground.
As far as turn off the switch, I do not have the "step disable switch" on my model, and I do not think that it is a good idea to have this switch because if you do so, the height of the coach floor to the street level is quite high, it will cause more harm than help if you turn it off and forgot about it when you open the door and walk out without thinking.
That said, I would not worry about the steps did not fully extend on the grass because it will automatically stop when it reach the grass, if did not hear the motor trying to force the step anyway, at least mine was working fine for couple weeks before I have asphalt the parking put in.
Tam & Ha
2016 Georgetown XL 352QS
2011 Jeep Grand Cherokee
2016 Nights Camping - 2 for trying out and love it...