Here is an industrial LTE router designed to withstand harsh conditions. The Digi IX20 comes with dual SIMs for failover and uses SureLink technology to maintain cellular connections in adverse conditions. This tough router has WiFi, Ethernet, and cellular connectivity.
The Digi IX20 can operate in -40F to +158F temperatures. It uses Digi TrustFench technology with encryption for secure connections. The companion app lets you register your device with a QR code to manage and monitor the health of your network.