Decades ago I was budd's with some amazingly knowledgeable people. With their input I added a pneumatic leveling system to an RV. Why pneumatic, I had air and bags at the ready and at the time hydraulic systems were the #1 service call on RV's.
Armed with a bit of knowledge I was looking over my 02 Roadtrek to add a leveling system, waaaay too much time and effort for me.
Look at this if money is not an object, likely cost as much as I paid for my RT!