You need energy to produce a force that compensates gravity. So if you apply that force for a huge amount of time, will gravity ever be depleted?
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While gravity is not free energy, you can be smart about it. There is an electric dump-truck that never has to be plugged in. It drives uphill unloaded, gets a load of material, then drives back downhill. The use of regenerative breaks with the heavy load charges the battery more then the amount needed to drive back uphill empty.
https://www.greencarreports.com/news/1124478_world-s-largest-ev-never-has-to-be-recharged
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