Check out these useful little workhorses. They are stackable. You can put castors on them. They come in sizes up to 2.6 yards and are rated at 4400 lbs. Use a forklift or a crane for the full rating. dump out the materials with the drop bottom.
A low loading tipping bin that can be set up with a perforated sheet to drain liquids from solids then removed with a spigot.
Forklift tipping bins are something we build a lot of. This 2012 version is low. Sizes range from this little guy to 2 yards.
The lowest tipping bins available. When you need to move large volumes and are loading by hand, this is the safest tipping bin available.
Barrow Tipper Model 2041. From 0.25 yards to 1.3 yards, these tipping bins on castors move materials in tight locations, then dump out with the forklift.