Unless you have changed the compressor on your bus and unless it is seriously different from mine if you set your compressor cutoff pressure to 110 or greater you will have sufficient pressure in the system to level the coach, including lifting the front end.
It takes about 100 PSI maximum to raise my front. The rears lift around 70 or 80.
All you need is to turn on the key and operate the controls, but remember the air compressor has a fairly large switching differential so you need to level the coach before it cuts off or you need to bleed air down to the cut in pressure if you are below the pressure required to lift the portion of the coach you want to raise.
You can make a big project out of it by airing up the aux air system with external compressors but it is nice to use the one on board. But plan on burning it out if you constantly try to use it for leveling. I set mine at an 80 PSI cutout because it is much more than I need. If I have to level I just start the engine. No sense sending a boy to do a man's job if you know what I mean.
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