Greetings, may I ask for a bit of help with a steel fabrication project? Pictured below is my design for a trailer-hitch mount to be used with a Harbor Freight tire changing tool. I need help determining the thickness and composition of the tube and plate steel to be used in the project. I don't want the mount to be damaged by the force of operating the tool. Note the inset picture; lifting the tire bead over the edge of the rim can require 100# of radial force on the 36" lever. I'd appreciate it if someone could review my design and offer improvements (or reductions) as necessary. Thank you.