How much does a long bed box weigh?

[raylube]

Trying to check ride height and pinion angle with bed off, cant get to bed as it is buried under 3 feet of snow until spring. Heaviest thing in garage is the Eaton
I took out. wondering if a Eaton axle and wheels would equal weight of box ? Currently have swapped 14 bolt bolt with old Eaton axle sitting on top of frame rails. 1964 k20 truck long bed with plywood bed floor.

[raylube]

Weight simulation