Yes they are longer....but if you measure the average I think more of the weight is carried in front of that "24" behind the pins". I found some of the old ratings (at the pins) where the capacity was a few hundred lbs more. (check out a L3540 for example)
There is a video of some guys in Wisconsin that have an MX5800 (same specs) and it seems to work "ok" for them. I think it's at the limit....but do-able. I suppose a person could shim the hydraulics a little bit. I'm sure the tractor(s) would pull it....especially in lighter soils. I was "close" to trying one with my L3560HSTC (fluid and heavy duty loader).....but decided I did not need the coolers and extra size here. I do not need this drill....but I would like to hook onto one to see how it works.