I don't know......maybe check again??
I installed one on a FL70 just like mine with a single axle and that a while ago, I think in April. That truck comes in at the same loaded weight, 32k, as mine does. When we had to load it with maximum weight to get the heavy side of the calibration done, we used pallets of cement because of the density. The problem was the fork lift driver ripped a bag open and it was a mess to clean. When it was all calibrated, the readout came in just as accurate as a CAT scale we were testing it against.
The cost is expensive, yes it is but if you are concern about what you haul and have had overweight issues before, it may be a very good idea.