Why not use an AV OEM pedestal?
http://evsolutions.avinc.com/uploads/products/30_AV_EVSR-RS%20PedestalMount_10137_060311.pdf" onclick="window.open(this.href);return false;
Clipper Creek makes one too for their charging stations...
http://www.pluginamerica.org/accessories/clippercreek-cs-series" onclick="window.open(this.href);return false;