After looking at the overpriced tubing tools, we decided to make our own tool. Cost: < $10. We bought two (2) vice grips from Harbor Freight ($3.99/each). All the other material, (~40") of 1" stock, (5x) 5/16 bolts & nuts, and (2x) 3/8" rod coupling nut, we had on hand. With a couple hours of work here is the tool we created:
Vice Grips:
https://www.harborfreight.com/5-in-curved-jaw-locking-pliers-63867.html
Coupler Nut
https://www.homedepot.com/p/Everbilt-3-8-in-16-tpi-Zinc-Rod-Coupling-Nuts-822281/204337391
tubing_tool_2.jpg tubing_tool_1.jpg