Hi:
The loader is 560lbs (I'm not sure this includes the POST mounts). and the 53" bucket is 180lbs. I wouldn't do it. Also, are your tires loaded? What about your
Ballast block? My little 2305 with the loader and deck on it weights over 3000lbs, probably maybe 3300 including the Canopy (1450 + 200[loaded tires] + 560 [loader] + 180[bucket] + 700 [ballast block or BH] = 3090. The deck would add another 200 and the canopy probably adds 50.
Also, what is the trailer for? You mentioned aluminum, is it a sknomobile trailer? If so there are other considerations. Is the floor plywood?
I have a 6000# gvw (3600lbs net) 22' inside, 30' outside enclosed snowmobile trailer that I was going to use for my 2305 with the rops folded (Femco ROPS), but after talking with the trailer mfg (mainly about re-inforcing the the ramp door) I decided not to. The Tractor will concentrate a lot of weight over the wheels and it won't be distributed well on the floor of an aluminum trailer (if it's meant for lighter things) - it might damage the floor or worse poke a wheel through the floor. (My floor had 2' centers on the aluminum cross members so the little wheels on the 2305 could have easily have poked through the plywood).
Instead I bought a 18' 10,000lb tandem axle steel trailer. I figured I had room to grow and it gives me space with the 2305 to throw on a couple of implements also.
Now that I have the 3720 I'm glad I did, I'll need the weight and the length.