If it were me I'd just get a whole house generator in that situation, seems like it would be a lot less than the truck with batteries or the batteries. The bonuses are I wouldn't need to replace an expensive truck with another expensive truck in the future if I didn't want to. 3 days is impressive, but I had an ice storm leave my family without power for 3 weeks once.

It's pretty strange that 135kwh of stationary batteries are more expensive than 135kwh with a truck attached, seems like some one must be running a screw job on the storage batteries.