Bottle is bolted to wall with long hose to cart. It is bundled with the 1/0 gauge power lead (52mm) and control cable back to the power supply. Has hooks on the side for the torch and ones on the back for the power/gas/control bundle.
That is just a wire feeder. I thing it weighs as much as my Clarke MIG was
Shelves have several rolls of wire (0.8, 0.9, 0.6 and alum/stainless), extra tips, brushes, shrouds etc. Lip on shelf is good for hanging C-clamps or vice grip clamps.
I had one of those Chinese carts shown earlier (Clarke sells the same.) Had bottle on it with the small MIG. Worked OK but a bit tall an narrow. Never fell over but always worried about it.