If fully loaded, it would weight around 9,000 lbs, and should be fine with just mesh. Now if you would install a lift, I may want to add footers with some rebar where the posts would be, if it was me. Shops all over do not use footers, but just install the lifts and have no problem. Note: Rebar in 4" concrete could crack or pop due to not being thick enough, that is why I suggest a footer where used. Hope we are not getting off topic.