A processor that can safely handle problems on the road does not exist. And if a pseudo trailer exists with it and a drive train, it's just an autonomous electric car. Buying two electric cars will not be price competitive with buying a larger vehicle for cargo/towing capacity, especially considering the additional hassle on the user (have to store two expensive vehicles, have to set up a pseudo tow between the two anytime you think you might need the capacity). So people will still buy large vehicles, there definitely won't be a switch "overnight". Besides, most of them already are bought based on an overstated/oversold need, making the purchase less rational will have a marginal, but not sea-changing, impact on buying habits. Encryption is good, but plenty of companies and individuals get hacked today, it will stop the vast majority of attack vectors but the idea of it stopping all attack vectors is borderline laughable. Why is landfilling trailers a positive thing? Preemptively replacing gear that is perfectly operational is part of the toxic consumerism cycle that has put our environment in this mess.

Speaking as an engineer, we may think about the best solution to a problem for years, but that doesn't mean we are solving the right problem