Been using them for years, collection of 20+.  Throw a wrench to the handle for extra cranking power, it will take it.  Frankly, I use them on galvanized pipe with little issue. Another brand has a design for a stand built into the heads.  I've added oak blocks with pipe holes and 2" extension above the head and screwed it to the heads.  The set-up sets on the blocks just fine, making handle cranking easier and a cushioned face on the clamps.