A lightweight, sturdy step ladder is a requirement for any job site. Ladders come in different weight ratings, but you should always opt for the highest rating available. While these a little more expensive, they are considerably more stable.
A great option is the Werner 6 ft. (7406) Fiberglass Step Ladder. Being made from fiberglass makes it lighter but still sturdy. It’s a great ladder that we always keep nearby on the job site.