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The tractor and FEL should weigh 4000. The hoe another 1000-1500 or so so your tractor weight is a good estimate maybe a little low. The trailer weight will be more than you might think. My 18', 10' GVWR car hauler style trailer weighs 2500 lbs all by itself </font>
Don't forget to add roughly another 700# if you have fluid filled rear tires.
I've got to agree with Highbeam that you are underestimating the weights. Tractor, FEL, BH, Fluid Fill are going to run roughly 5500#, maybe a bit more, without factoring in the weight of the trailer. A typical 18' trailer is going to be at least 2000#, probably more.
You are over the GVW of 7000# trailer easily. And there is no room for any implements should you ever want to add the weight of one of those to the trailer.
Now here is the NEXT question, do you have a vehicle that can tow 8000# to 9000#?