About that ice cream cart; I can't tell from the single picture posted, but the weld showing where the base meets the wall concerns me.
Some carts were built on top of a "brine plate" similar to how ice cream trucks were built. The brine is Calcium Chloride, supposedly stabilized to minimize rust, and it sorta works. Others were just a heavily insulated box with a dry ice cavity that worked well for a few hours.
If it's liquid Nitrogen cooled run away from it. Those systems can and have killed people.
Either way you really want to check the insulation for water content if you intend to use the cart. A wodworkers moisture probe will give you answers.
Second thing I see is that cart has been rewheeled, and the tires look like somebody set a chain of carts up to pull into position around a stadium & parked. The 12" pneumatics ain't gonna roll well.