That trailer sure looks familiar!
IIRC, those numbers are the ones that the factory posted in the brochure. When we were pulling our trailer home from Edmonton we stopped at a scale and were quite shocked to find out that the pin weight of the trailer was north of 3000 lbs with very little in the trailer! I think this is a good thing in your case because one of the biggest potential issues I can see with your plan is having too light of a pin weight causing handling issues. I'm definitely watching with interest. :)