I don't know how much mine will carry in weight. I've had the carryall a little more than half full and the FEL brimming full of mulch. Makes a very well balanced rig.
Recently, I had the carryall filled with most of the buckets I have to water some new trees. I had one 20 gallon, a couple 10 gallon, a couple 5 gallon and one 2 1/2 gallon container, all about 2/3 full. What's that: 2/3 x 52.5 gallons x 8.34 = 292 #. The mulch was more than this; I guess, probably closer to 800 # in front and in back, totalling about 1600 #.
With the no-dump, the back has to be loaded and unloaded by hand.
Ralph