As mentioned most diesels do let air out then level. Of course there is always someone that will have an exception. What I don't know is if the dp levelers have more travel than gassers. There have been times on my gasser that I have had the front tires off the ground to get level. Have not done that yet with our dp.
You may be able to adjust the starting point on your levelers. I adjusted my last gasser so they sat higher as I was always tagging them when boondocking. It's was as simple as loosening some hardware and moving the jacks up to the next notch. Other option is to carry some spacers.
Btw, I have not seen a lot of gassers with three steps, most I have seen are two just like the dp. We had to carry a extra step along for those uneven spots.