depends on which of the 4 i drive.
work p/u for farming
tire tools for changing irrigation tires/wheels, jumper cables, electrical supplies, hydraulic oil, chains, tractor oil, hydraulic oil for tractors, electrical test instruments, fuses and a transfer tank of diesel
dually for hauling hay and equipment
66gal external diesel tank for extended runs, tools (for whatever is needed) and odds and ends (i keep wooden blocks, chains, straps in the box on the trailers.
short job p/u (extra work p/u for kids helping on the job)
some of the same as the farming p/u, but with less items for parts runs.
leisure p/u
for traveling, extended whatever's needed times, sports games for traveling to kids events.
i'll probably be getting 2 more as 2 maybe for kids working to help?