[Land Yacht]

I am a full time telecommuter for a Global High Tech company which is hopefully 2 years away from retirement. My day is spent on WebEx meetings with audio and video. We started looking at evolving from a motor yacht to a RV a couple years ago. After research I knew working from the road full time would be a challenge. So, when this coach became available we decided to try to use as much as possible with careful planning for Internet work. We don't know at this point where we will be going. First thought is friends and family in the southeast and use their internet. Also, my company has offices in large cities but we really don't want to spend much time in those except maybe for a few days in route to some location. I am also wondering if a wifi extender would help me use some public wifi systems other than at a RV park.

Questions
1. I like the WiFiRanger as I want both wifi and 4G capabilities. Having both in the same box seems like a good idea. Did I read correctly that if wifi fails then the cellular can be the backup uplink?
2. Is a wifi antenna enough or do I need an extender such as the bullet? I had a bullet on my boat and it added latency (delay) that made doing voice or video intermittent.
3. I am planning to use a cell phone for voice and already have a MiFi card with Verizon. Will an external antenna be enough or should I buy a cellular booster?
4. I have not been on my roof yet, but see an old cellular antenna, fm antenna, over the air TV antenna, and an in-motion satellite dish. How should I mount any new antennas or use what is there? How do the cables come into the coach without leaking?
Thanks
Mike