A prepper will already be rotating out food and water anyway. Solar is still a good idea, but so is having fuel powered generators. Might not be too much sunshine in situations like a nuclear winter or geoengineering gone wrong.
reply>Diesel can't be stored forever. Maybe a few years with stabilizer. So you need to remember to rotate it out (and have some use for the fuel you're rotating out). Much easier to just buy some solar panels to recharge the electric truck.
replyMuch easier to use diesel in your diesel-powered vehicle.
And then you have much, much energy in your stockpile.