If you are talking about a 2155 ag tractor, then you are closer to 5400lbs. Minus 15-1800lbs for the trailer, and the tractor alone will put you right on the limit. I would figure 5500lbs for the tractor, 800 (to be safe) for the tiller, and 900lbs for the loader. 7200lbs of load, 9000lbs gross.
As the trailer is rated for more weight, the weight of the trailer goes up too. Figure an estimate of 28-3200lbs for a 14,000lbs rated trailer, so your right around 10,000lbs load. As I, personally, have never seen a trailer rated for 9000lbs, it's most likely you will have to go up to the 14,000lbs trailers.