This is not really designed as a lifting point though it could be used that way if you utilize 3/16" bolts, nuts and washers to mount it rather than the supplied wood screws. Structurally it is well made but how you mount it will make a big difference as to how much of a load it can carry. Use good judgement if you plan to proceed with this application.
Yes is can be used in an exterior application. It is zinc plated so it is relatively resistant to normal weather conditions but it is not designed to be in constant wet conditions.