Ok we know that ultra-capacitors carry about 10x less energy/kg than current li-ion batteries. This means they have limited use in small consumer cars, other t

Ok we know that ultra-capacitors carry about 10x less energy/kg than current li-ion batteries. This means they have limited use in small consumer cars, other than maybe helping the brakes or conditioning power. What they lack in weight, they make up in charge/discharge times. Being that a truck weighs multiple times more than a sedan, it's batteries are unlikely to absorb regen braking. So a small capacitor bank makes sense. A large capacitor bank would be useful if the truck was using overhead charging cables for a small section of the road. Or if a public transport bus was quickly charging between every few stations, it could then function all day. The large weight of the capacitor bank isn't a problem if it's used in a charging station, where 3-phase 400+ volt power may not be available. This means that any level 1,2 charger can be upgraded to a level 3 without needing to dig any trenches, further improving the user experience of the car owner and reducing range anxiety to a minimum.