I'm thinking about building a run stand that would mount to my 16 foot trailer- - - -along with my water brake dyno. All I'd need to do some torque testing at somewhere like Homecoming would be a water supply and maybe some 120 volt power. A small AC generator would make the setup completely self-contained once the onboard plastic water tank was filled with about 500 gallons. The dyno bolts onto a bellhousing like a transmission, and loads the engine with a water turbine, sort of like a torque converter on steroids. Once a series of RPM and torque readings are taken, it's a simple matter to do a couple of calculator operations to figure a HP curve.
Jerry