well i'm in the same busineess as you. i do a fair bit of tee work with a turntable 6" on the back and she is happy as larry with it. i know someone who runs a 9"/10" in his u900. You can tweak them as well to about 110hp (brian or moose's area) i've run a 6ft topper as well off it.
i bought an old snow blower and have put on PTO and linkage at the back. (there are some pics of her on here)
The fuel side isnt to bad. my defender 110 will use more loaded than the mog will. i recon she runs on 20ltrs a day when i'm out chipping with her.