Also remember that kids grow up and your RV sleeping needs may change over time. We bought a bunk house trailer years ago but when the kids moved out we wanted the bunk space back because they rarely slept in the bunks anymore. So I guess my point is your requirements may change over the years.
As far as pet safety, I have a temperature monitoring system (mine is from RV Whisper) that sends me email and text messages if the temperature gets too high or if shore power goes out. It has been working well for me.
I do not have gen auto start, but even if I did I would still want remote temperature monitoring. It just makes me feel better knowing what the actual temperature is in the RV.
Good luck finding the right RV for your needs.