A popular means of burglarizing gun stores is to steal a large truck- flatbed wreckers are popular- and at high speed BACK it thru the wall. Grab guns, run. Helped a friend set up his shop- only one approach to a building wall. 10 ft out, we set these lovely planter boxes. They are about 3 feet high- filled with topsoil, nice flowers. Oh- after placing the (bottomless) planters, we took 6 ft lengths of railroad rail, and drove 3 1/2 feet of them into the ground vertically- 18 inches apart. Then filled the planters with soil.
They look nice, flowers are nice, and the railroad iron should make sure that the planters are adequately anchored against the high winds in that area. Or a Caterpillar D5 dozer.