Like others have posted. You might have to step it up "sorta" to get it level.
When I go to Michigan Speedway for the races, I have to do something similar.
Unhook camper, raise tongue as high as it will go. Place blocks under the stabs. Lower stabs onto blocks, raise tongue jack and place more blocks under it as well as the stabs.
I don't have an issue with the front being supported by just the stabs. Each one is rated for 3,000lbs. They're nothing more than your typical scissor jack you find in most cars and are more than capable of supporting the front of my camper for a short amount of time.
Nice looking rig by the way.