I feel there are good mitigating options here: - they could use vehicle-mounted transceivers with much better antennas - they could use redundant transceivers

I feel there are good mitigating options here: - they could use vehicle-mounted transceivers with much better antennas - they could use redundant transceivers on different networks - they could map out routes with best signal. Remember this is last mile only, so it's not a huge area. Instead of going the shortest way a la Waze, optimize the route for best signal.