I recently completely took apart tower 4 and rebuilt it from scratch because it was really bothering me how non realistic some parts of it were as well as it was my old style of building.
Tower Ladder 4 is still a pierce Arrow XT mid mount ladder. The only thing that is original from the old truck is the stick. The bucket, cab, rear compartments are all new. Some new features that you can see in the pictures that I have never done before are wider extending out riggers as well as fold out steps to get up to the turn table.