No they are set to this height. Where my trailer sits and ramp comes down the drive slopes a bit. So in the pick you see a gap of almost 9" but on other end its 7".
Here are pics. If you wanted smaller than 5" you could always cut down with metal saw.
You could lower your door take tape and lift it to 5". That would give you idea how high it would raise door. What you saw in first pic was over 9" due to slope in driveway.