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The roadside rescue companies are kitted out for ICE vehicles. Maybe the question should be 'What are the roadside companies doing to ensure they support members using non fossil fuelled vehicles'.
After all, I doubt the membership fees will be less for EV owners.
Cars.com tested them out: Cars.com Field Trial: Mobile EV Quick-Charging - KickingTiresA more industrial approach to EV rescue trucks might use something like this:
30-180 kVA onboard truck generators - realacpower.com
In fact, they put an Eaton L3 DC (CHAdeMO) 50kW charger on the back of their demo truck for a concept vehicle / case study:
Mobile Electric Vehicle Recharge and Rescue Truck (PDF)