Top 100: It's All In There — Compressor, Generator, Welder

Within its compact, weather-tight package, the 450 PowerBox houses a 28-cfm air compressor, 12,800-watt generator and 350-amp welder—all powered by a 26-hp diesel. If you don't need this much capacity, five other PowerBox models (11 to 25 horsepower) have lesser-power compressors, generators and welders in an integrated package. All models from Dynamic Power Source are available in four external configurations: drop-in service body, integrated service body, pickup and flatbed/trailer. PowerBox models are designed to install quickly and can be removed and left on site. Estimated price: $3,000 to $15,000.