I've been tasked with setting up a camera/surveillance system on an auction services trailer.   Camera can be powered via the internal generator but must run off 3G/4G LTE or Cellular Hotspot via wifi.   Would like to have it sync/stream to cloud host as well as local SD (or internal storage).   Audio recording is required. 
  
Any good recommendations?   Wifi cloud cams are a dime a dozen but I'm not an AV person and I want to spec something that will withstand the elements and last a long time as it will be a permanent installation. 
  
Thanks!