[SagelyGuru]

You can make that one truck descend five times faster, giving the same output.

[randallsquared]

"...for a given drop rate" seems implied.

There will be a maximum drop rate that is supported by the machinery being built, and it seems reasonable, though not mandatory, that a 5x weight system will be designed to handle more generation than whatever it's 5x of.

[rakoo]

The total available energy in such a system is defined by

    m * g * z

where m is the mass and z is the elevation difference. It doesn't depend on the speed at which it goes down