FWIW, you don't specifically need a steel shank. There are several well built hiking boots that have a full length polycarbonate (plastic) shank. You would never know that it isn't steel...other than the ounce or so less in weight.!
Go to REI, Adventure 16, Erehwon Mountain Outfitters, Hudson Trail Outfitters, or whatever you have in your area that sells outdoor gear and speak to a Phil Oren trained bootfitter and they should be able to tell you which boots have full shanks in them. Tell them what you want them for. When I sold boots, we had a couple of boots that were the "go to" boots for linemen and tree climbers. Look for heavy duty mountain boots.
love
nick