https://www.thedrive.com/news/evs-are-too-heavy-for-current-road-weight-limits-car-haulers-say
"—the 9,000-pound GMC Hummer EV attributes almost one-third of its weight to just its cells"
Wow. That really brings home how much of a win it would be if you could increase the energy density of cells. If they were twice as dense, you could drop some amount more than 1500 pounds from the Hummer without losing range.