I think the V blocks go into an eclipse vise to hold pipe. It's a well known brand.
Great deal and I envy you the cart.
For others still hunting for a forge cart: find a junked gas grill and remove the grill part, (if Al sell to scrap yard!), and bolt a piece of sheet metal where the grill used to sit and mount your gasser to that. Easy to wheel and even has a place for a propane tank. I removed the wooden bars on the "handles" and replaced with steel ones to make tool racks.
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Thomas
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