I have a sander for my 5600"F" and performed a rather extensive search on suppliers, manufactured and models. The Sno-Ex Vee Pro 3000 is the basis for all others. My Bobcat unit is exactly the same as the Sno-Ex product. The Sno-Ex 3000 also appears to be the base for the Kubota model as well, probably used on their RTV family. SO take your pick on the model that is best supported locally. A few notes on the product:
1) .5 yard is small, great for my horse farm but may be too small for any commercial or industrial application.
2) Be very careful on the material of choice. 100% salt is great, 100% sand is horrible. A 50/50 mix works OK, but I found a mixture with larger grain material and salt is best
3) Test before you fill!! Most newer Vee Pro 3000 type products have baffle system made up of 3 plates. Getting the material composition correct needs to be aligned with the proper baffle.