Using sea cans welded together with firing ports cut in could be a good option for cover, sand bags to help reinforce. One thing Ive used in my campaigns is jersey barriers. Easy enough with a crane or forklift to remove from hiways and construction sites and stack able. In our local cement plant they have walls made with the large brick like lego cement blocks. Many of the cement plants here make and use them in there yards especially the landscaping yards to keep rock and dirt separated and they have hooks in them to lift and place them. there about 2 feet tall and wide by 4 feet long.
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