I would think that would not be a good idea. The scale is basically a hydraulic cylinder, and the inside pressure is converted to pounds via the weight gauge. If the clylinder is engineered for 2000 lbs, then placing something that weighs 5000 lbs.on the scalae will probably be too much for it. You would probably blow a seal, or worse case cause the casing to crack and/or explode. Now if you are on the border of 2000, then who knows if the scales are engineered for say, 10% over. Maybe an mechanical engineer can chime in here.
I wouldn't do it. Buy a heavier scale.
Chap , DW Joy, and Fur Baby Sango
2006 Ford F150 Super Cab 4x4
2008 Surveyor 263