In my case I removed the factory ladder, which was unable to hold my weight and had other issues, and replaced it with a much stronger (but not much heavier) extension/step ladder, This ladder is good when I need to get on the roof, it's good when I need to wash/wax the sides, I can use it in many ways the fixed ladder could not be used and it has no problem with my 300 plus pounds plus tools and equipment.
The thread is titled ROOF LADDER by the way