Don't waste the time with the big level on the front.
Buy or borrow someones laser level shine the level beam under the RV move the RV around and shim under the tires until the RV is level side to side measuring the bottom of the frame near the wheels at about the same location front to back on each side. Now unhook the RV and adjust it so the bottom of the frame is parallel to the laser beam front to back and side to side.
Now the RV is sitting perfectly level because the RV is built on a level frame at the factory. Buy two of the small Hoppy levels that have a smile shape where the bubble moves in. I will post a pic in the am. Get some GOOD quality adhesive that once dried won't move. Put some adhesive on the back side of the small level remove the double back tape first if there is any. Now place one on the side where the controls are near the front where the RV steps up so it's easy when you adjust front to back. While holding the level PERFECTLY level hold it in place with some quality blue or green tape don't remove for a couple days.
Do the same looking at the front of the RV under the overhang on the upper right corner this will be for the side to side leveling.
I did this on our 36' Mobile Suites that only had the 4 point leveling system and it worked GREAT. I packed a variety of 10" x 10" pcs of varying thickness pcs of plywood for the side to side leveling.