Recently decided to take a Gladiator tool cart and use it for a welding cart. I beefed up the bottom and added a bottle shelf and bottle chains. I will be adding a chain lower, and hooks to hold some of the stick, Tig, and Mig torches and leads before it is finished. At the present the back is not suprising back heavy. If I were to put both my bottles on it would flip over backwards. I was thinking about buying a single caster and putting it in the middle then I thought axle and wheels but don't want to lose the maneuverability I have with 4 swivel casters. Any thoughts or suggestions would be greatly appreciated.