"YMMV" = Your mileage may vary :B
It is close to impossible to find any trailer that does not incorporate the word "Lite/Light" into its marketing. Lite/light? being relative terms the practice has been taken to extremes. If a TT is in fact manufactured very lightly it will come at a cost either in terms of structural integrity or the lack thereof or a serious cost increase to reflect the use of Azdell and other high end more efficient materials.
Along with weight numbers length numbers share a great deal of ambiguity. A 29 {like the OP described}, might be 33' - 34' overall or 29' overall marketed as a 26 - 27'. Payload of a TT often referred to as OCC/ROCC is another dead give away as to the quality that may or may not be present. If a 29 footer has 1,200# of payload or less something is seriously wrong.
A 29ish' TT is rapidly approaching the point where a single 13,500 BTU AC is simply not going to get the job done. Is the furnace less than 20,000 BTU? They are on the cheap models. Does it come with two Group 27 or larger batteries? Two 20# {minimum}, propane cylinders?
Can you load the TT for a normal camping trip and come home with full black and gray tanks without going over GVWR? This should be no issue for a well built trailer as dump stations are often backed up {no pun intended}, at the end of a weekend.
Frankly if I ever go back to a TT I would be looking g for something built like the proverbial tank like an Arctic Fox just to name one and mating it to an adequate tow vehicle. If you have enough truck there really is no reason to go super, uber, ultra, very, trail or any other form of "Lite/Light.
Once again...
As always.... Opinions and YMMV.
:C