We have a 2014 25' Sunseeker 2300 on the Chevy 4500 chassis. The rear does sit higher than the front. We don't have levelers, but use the "lego blocks" instead. We almost always camp at state parks and such. Most of the time the campsite is sloped up or down, and I find a spot on the site that lets us sit level, even if I have to back in. But anyway, if I have to use leveling blocks under the front tires on a perfectly level slab, I only need 2-3" under the front tires.
So I wonder, does your unit need so much lift at the front end because it is lifting the rear end quite a bit during the leveling process? Otherwise, I can't imagine how yours could need the front tires lifted 5" off the ground.
Also, I have used a digital level and discovered that on level ground the slope in our rig from back to front is only about 1 degree. That amount is harmless to the fridge, and insignificant to daily living. My wife and I like having our heads elevated while sleeping, and the rear-high orientation does that. So in real life I rarely raise the front end. Only if we are parked on a site that also slopes down at the front of our rig. I would be very interested to hear what slope there is inside your rig when it is parked but not leveled, on level ground. You could calculate it with a longer level, like 24" or 48", and measure how high off the surface you have to lift the low end of the level to make it read level. Ask here if you need help with the calculations. If you are interested in doing it.
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Currently RV-less but not done yet.
