While its on hoist, i would remove box mounting bolts, and anti-sieze them. Did a fuel pump on one, lifting the box off was a game changer. Some guys cut a hole in the bed floor. Had one years ago, i think they used an axe...
I put a couple pumps in my Dakota's. I removed the box bolts on the drivers side and the gas fill hose and loosened the passenger side ones. A 4x4 and a floor jack tipped the box far enough to get the pump in and out.