I carry a 20# tank and I carry it in a plastic milk crate we got at Home Depot the tank is a tight fit in it and I secure the crate to the basement columns with bungee cords. Been doing that for 8 years and never had an issue.
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS