Hanging scales make a lot of sense for weighing hay bags, flakes, etc, but a shipping scale with a platform with remote display* usually has a much larger capacity and design that makes it much more useful for hard feeds and everything else, even hay bales and just general use. I use the h*ll out of mine for all sorts of things. $40 bucks will get you this 200 pounder at Sam’s Club and I’m sure Costco, etc, has similar options.
http://www.samsclub.com/sams/shipping-scale-200-lb-capacity/prod7590375.ip
If you feel like searching through the 5 million scales like this on ebay, you can score one even cheaper and look for larger platforms, capacities, etc, at similar bargain prices. Probably some good deals on Amazon, too. But you can get a lot for your money if you don’t sorting through results on ebay; some are from USA sellers, others from China or other international places. Good deals and usually only take a week or two extra time to arrive, but harder to return if defective, etc. If you go the Sam’s Club or similar big box store option, at least you know you can take it back to them, fast and without a hassle, if it doesn’t work out.
*The key is the remote, detached display so you can put bulky items on the scale and actually see what it says! Very awkward or even impossible to read the display when it is down there on the scale itself and totally covered by the big bucket, box, hay bale, whatever.