"carries our heavy loads every day." The Lord's care for his people is spoken of as if he was physically carrying their troubles as a burden. (See: [[rc://en/ta/man/translate/figs-metaphor]])
These phrases mean the same thing. Here "is our salvation" can be translated with the verb "save." Alternate translation: "the God who saves us ... Our God is a God who saves us" (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-abstractnouns]])