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There may be a potential alternative for the long foundation tube. However, the shorter tube would use the standard 6-ft long tubes with channel strut between post 1 and post 2 or the next increment shorter (don't recall at moment) with channel strut and soil plates. In both cases, new holes would be needed in foundation tubes to lower strut to below grade versus above grade. For this design, the strut cannot be above grade as it caused vehicular instabilities in the bullnose crash test! Let me know if you need additional information on this.

If they cannot get the 8 ft tubes into the ground, they still need to acquire somewhat large depths within rock to place the other tubes.