Non-FIRST Motor Suggestions?

[ctt956]

This doesn't need to go fast; probably not faster than 5 MPH(7.33 FPS). It would need the ability to drive on most surfaces, but it would mostly be driving on concrete, asphalt, and maybe dirt, grass, or gravel. Hill climbing ability is important, and so is weight pushing and pulling. The low speed should allow for high torque gearing. I checked wheelchair motors, and they seem to be on the expensive side. I considered CIMs, but I'm not sure if they could handle this much weight. Could they run at 24 volts? The runtime would vary, but the battery would limit it. It would mostly be fairly short though.