Moses uses a question to emphasize that he cannot solve all of their problems by himself. This rhetorical question can be translated as a statement. AT: "I cannot carry your loads, your burdens, and your disputes by myself." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Moses speaks as if the people's problems and complaints that he needed to take care of were heavy physical objects that he had been carrying. AT: "take care of your problems, your complaints" (See: [[rc://en/ta/man/translate/figs-metaphor]])