The manual says 1/4 - 1/2 below the fill spout.
When I kept mine that high it tended to leak past the push in plug.
I keep mine about 1 - 1 1/2 below.
With all your jacks and slides fully extended, if you still have an inch or more of fluid, that is probably not your problem.
On my tank I have a sharpie mark that represents a full tank with all the slides out and the trailer leveled with the jacks.
Easier to check that way.
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Thanks,
Duane
2019 DRV MS 39DBRS3
2020 F-450
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