I currently have a 3g "enhanced" connection from Netspeed. They are a great friendly ISP with very cheap pricing.
The modem provided by them was a Huawei B315s-607 which currently runs off a 12v setup. Now the modem works for what it does, however, it lacks many advanced features for what I need. Especially a QOS system. For example, the moment anyone uploads something, it will immediately max out our connection and slow everything and everyone else connected to a halt.
I am looking for a modem that runs off 12vDC that would offer more advanced features and have a 3g/4g modem built in. It would also need support for an external antenna, as this is what our setup looks like: