Just a Guy
Just as a FYI. My wife has used the Trilogy 100 for almost two years now. It has a six hour battery and is realitivy light weight. It has allowed her great mobility. Just like your father, my wife chose not to have a vent and we where informed the the Trilogy might extend her life. Currently she is 100% dependent on her Trilogy to breath and there is no doubt it she is still with us because of this machine.
The down side is that the Trilogy, however nice, is not a cure for ALS and it has continued to progress. When she decided not to get a vent I thought we would not have to worry about having a discussion about when to take her off of some machine, but since the Trilogy is working so well, we had to talk about that just the other day.
Best wishes to you and your father. He is fortunate to have you by his side