Paid 20K for my 2013 TBUD-G in May of 2013. The "G" means it has the garage at the back which is just a big storage closet accessed from the rear. That adds about 2 feet to the overall length and also some weight. Also, it comes with 5000# axles so my cargo capacity is a ridiculous 4700#. I mention all this because that undoubtedly added to the price.
When I was looking on the lot I saw the triple bunk model and I think it was about 1K more than you paid so I think you did well. Also, I got them to throw in the WDH and anti-sway. I'd say you're definitely in the ballpark, leaning towards a great deal.
As for the trailer it's been an overall great year with it. Nothing too major. My water heater electric thermostat went out and there were a couple non-working lights (we missed it at the PDI)... and one window shade was too short (also missed at delivery). I love the huge slide, U-shape dinette and spin around TV... and of course my garage at the back
For weight mine rolls down the road loaded with an average amount of stuff at about 7500-8000#. As best I can tell I have about 1100 on the tongue and the TT axles usually weigh about 6500-6600. I'm towing in a 2500 Duramax so I'm not too worried about the weights but I do keep an eye on it.
Assuming yours doesn't have the garage and the HD axles like mine I'd think your overall weight should be +/- 1000# less... maybe more. I capable 1/2 will do but do keep somewhat of an eye on your weights. Also, maybe think about getting some LT tires and maybe airbags if it's close at all. Probably not necessary but I tend to over do things.