Middle-earth Extended Edition is a project with the goal of expanding the game with new units, heroes, spells and factions as well as adding unused features existing in the game and bringing more realism to its combat system.
For the full list of changes related to the Siege Ladder and Rohan Armory, please read the 'Rohan Update' news article in the 'Articles' section.
Credit for Siege Ladder's model goes to GothmogTheOrc and Celeglin.