I find the bubble window to be completely useless, and it fogs up like mad in the winter. Regarding the floor window, the bigger the better. With the small one and a helmet on it can be a struggle to see the load, especially light loads wih some head wind.
Without a window I’d be left to using the mirror. Can’t see myself being able to lean out that far through the door opening.
Also - it sounds like most of you use really long lines, 100ft+? We tend to use 50ft unless there is a good reason to extend.