Now making room for that aforementioned fuel cell. See how big that x-member is? It was an addition put in place for bed rigidity. Will be re-purposed later (mid section), and the ends will be smoothed and welded in place.
Now the fuel cell can sit lower than the bed, but higher than the lowest part of the step fenders (will never be low enough to reach the ground, even aired out).
Thank God for folks that understand the purpose of a truck that rides low. (See exhaust commentary).