It really seems like EVs should have easily replaceable batteries, so that in situations like that you can just have roadside service bring you a charged battery and swap it out. Or for that matter, charging stations could pre-charge batteries, and you pay to swap your drained battery for a charged one.
(For context my car uses maybe ~1.5 - 4.0 times as much power when pulling the various sizes of U-haul cargo trailers)
I'm sure OEMs don't want to warranty 3rd party equipment connecting to their vehicles and making charge/discharge, cooling, securing heavy packs, etc. reliable.
The next biggest issue with swappable batteries is responsibility. If all of the batteries are shared, who pays for a new battery when a battery reaches its end of life? This problem will have to be solved at some point anyway since nobody likes paying $15K+ when their vehicle battery reaches end of life. It would make much more sense to amortize this cost over the life of the vehicle. It would be easy to do that with higher fees of battery swaps, but people don't normally like higher upfront costs even if it works out to the same in the end.
Tesla stopped supporting it.
https://en.m.wikipedia.org/wiki/Better_Place_(company)
they were probably 25 years too early