you can rent scales at morris scale co. they are located in tualatin, or. 1-800-92-scale, I am in kennewick,wa if I were closer I would let you borrow one of my rentals, they are 4x4 5000lb platforms and will cost a little $$ but you can call and talk to the service dept and get a firm quote for a day or two, I am a technician for these guys in eastern wa. wish I were closer,,,,,you would only need one scale and just move it from corner to corner making sure the rig is level each time you weighed,,,,