I own a 97 L2500 4WD w/loader and run a 6' bush hog on it and as for power it handles it fine. The biggest issue with handling it is the fact that it is not a live PTO but if you keep the RPM's up I haven't found it to be much of an issue. Usually I can run it in Gear 7 but if the grass/brush is really heavy and thick than I usually have to drop it into 6.
I run a multitude of implements on my tractor and 6' bush hog probably is the one that works the tractor the hardest but the tractor is fully capable of handling it. The lift capacity of the loader I would say is probably on the upper side of capabilities for tractors of it's size.
It's a workhorse of a tractor but with old school technology. It's not a synchronized transmission so if you have to grab another gear you have to stop and it's not a live PTO but the thing is built like a tank. I have almost 800 hours on mine and have not ever had one single mechanical issue.
It will fit on a 16' tandem axle landscape trailer with the bushhog attached if you remove the gates but if you are doing a ton of mowing you might be better off going with a larger tractor with hydrostat (hydros generally take about 5 hp away from the PTO compared to gear) and a live PTO.
As for my opinion of the L2500 it lacks a lot of luxuries that many tractors today have but if your looking for a tough smaller tractor this is it.
also have a L2500====real workhorse with front bucket-0 mechanical prob other then the usual hyd hose failing once in awhile- it has 438 hrs on it and im the second owner- has gear shift but thats no prob for me------love this little tractor-and i've prob used about all the green, red, orange in my 73 years-just make sure its rated to do what you want it to.