I drive by a police scale every day in St Charles, IL. It reads the whole axle, but I'm pretty sure there is enough concrete next the the scale, that you could get each corner. 99% of the time, no one is around, which means you can just drive onto the scale at will. One time there was a cop there weighing a semi, so I asked if he cared if I drove on the scale with my RV. He stated that as long as no one was around, it was perfectly fine to weigh my coach any time I wanted to. It is on a side street in an industrial complex, so it is very low key. Digital readout easily viewed from the driver's seat.