Platform scales are actually available in all shapes and sizes. The standard size floor scales are normally 48"x48" (or 4'x4') with a 5,000 or 10,000 lb maximum capacity.  Those are usually available and ready to ship same day. One thing that sets certain scale suppliers apart is the ability to offer various size systems.  If you're looking for 2'x4' pallet scales to 5'x7' pallet scales then you probably need to take a look at large volume floor scale suppliers like 1-800-SCALES.com