Picture this raised bed planter but waist high. No one is going to look at it and not think it's anything but a planter built so people don't have to bend down to weed and stuff. The wicker is repairable by the owner. Sandbags and stuff rot and need to be replaced. Now many does a person *actually* think they can buy and store? But the wicker? Grows on trees. Wicker gabions would be a good choice, filled with rocks and dirt to stop vehicles and grouped as they were, provide cover to defenders.