I own a pair of Hobart 210 gas MIGS on a HF welding cart and it carries a 120 CuFt 75-25 gas bottle as well but the cart I really like and use is a Vulcan drawered and door'd welding cart. it's the high buck one with big wheels (that swivel and lock) and the top carries not only my TIG welder but a plasma cutter and an Everlast water cooler for the TIG. I run a CK series 2 water cooled TIG torch which really is a requirement for running higher amperage welding Aluminum. The Vulcan carries 2 120 cubic foot argon bottles, one set up for welding, the other is a purge bottle for purging when welding enclosed projects like tanks or stainless exhaust tubing.
The build quality on the Vulcan is top shelf with ball bearing drawer slides and a large lockable storage compartment with a round pin lock.
Of course my O-A setup lives in a commercial welding cart I picked up at a machinery auction. I run a 240 cu ft oxygen bottle and a 120 acetylene bottle and both are very heavy. I own all my gas bottles outright and have them filled at the local Air Gas compressor station. I dislike beat up rental bottles and all my bottles have our company name on them as well. I buy my new filled bottles from Mississippi Welders Supply in Winona. Mn, shipped to the shop via Fed-Ex. Have not bought any in a while as I always have extra filled bottles on hand. Last time I checked a 120 CuFt bottle of Argon or 75-25 for MIG was 365 bucks delivered and full (2500 psi) of shielding gas.