Regarding Antigravity and other Lithium automotive batteries... I can see the appeal. The weight savings is nice, as is the ability to "jump start" the vehicle with reserve capacity by pressing a button on the battery case. But...
Lithium is a much more volatile battery chemistry than standard lead acid or AGM. I'm not sure which specific lithium chemistry these companies are using, but some of them are particularly nasty. Like spontaneously combusting gases if they rupture type of nasty. On top of that, I don't really see the point in saving 40lbs of weight out of one of these heavy trucks unless you've already stripped everything else possible and are chasing faster track times.
As always, diffrent strokes for diffrent folks, but personally I'll be sticking with AGMs.