I have a TN55S, which I think is a similar tractor (I didn't say the same

), with a loader. I (barely) am able to move it on a 10,000 #, 16ft flatbed bumper pull. I selected a bumper pull for the reasons others have stated -- it fits anything with a good bumper hitch. And I can still use the bed while using the trailer. I didn't have this tractor then.
My next trailer will likely be a deck over (most GN are this way) bumper pull in the 22~24 foot range. My guess in the 12~14,000 # weight rating. Remember that the ratings include the total weight (trailer and load). The deck over bed will also be convenient in using it for other loads, though with the higher deck height, almost requires a tractor or fork lift to load/unload.
This may sound like a strange thing to do, but on my trailer I keep a short log to stand under the trailer end when loading my tractor (what a surprise when the truck took off when I was loading the tractor --- and the tractor brakes had absolutely no affect). The trailer tongue lifted the trucks rear wheels off of the ground. Some trailers have a leg for this, some ramps (the flip down with legs) perform a similar function. That brings up a point -- you need ramps that will work for your loads (length and method of deploying them) or you will always fight them. Some like slide outs, some like flip downs, some prefer dove tails (less ramp length and weight for the ramps), some like the flip up dovetail (flat bed when up),
Proper load tie downs too. Not sure if that is a moving target (law wise) or not. Plenty of posts going on ad nauseum on this issue alone.