Hey guys I'm working on my first forge and decided on a 19 inch long steel mailbox for the body. I'm going to use one inch thick hard firebrick for the bottom and line the rest with Inswool and Satanite, and I am also spraying the outside with rustoleom high heat spray. I want to put coat it with ITC or Plistix at some point, but right now my budget doesn't permit that. Anyways, my plan is to use the existing holes in the bottom of the mailbox to bolt it to the top of a steel rolling cart with a shelf on the bottom that I can place a 20lb propane tank on and run a hose from it up to the forge. My question is, will that be enough insulation to keep from melting the cart? Thanks for any help.