Hi Jason,
I might be able to assist you with some ideas on the mobile emcomm side of things. I built a similar rig on an ambulance chassis to volunteer its use with my local communities. There are lots of options available to you, depending on how extreme you want to go with it. I opted for cellular service as the primary means for Internet connectivity, with HamWAN as an alternative path for VoIP, RoIP, Winlink, etc. There are also other solutions for bringing outside WiFi into the rig as another point of connectivity.
I've had a lot of people ask about the equipment I used, which lead me to build a website so people can reference the build-out process. It's still a work in progress, but most of the information is there, which should give you some foundational ideas for your rig.
Feel free to reach out to me off-list if you want to dive deeper into any of the details.
Regards,
Kyle Burgess
KD7IYT