Consider that the average RVer packs about 1200 lbs of stuff into a trailer....mayber 1000 lbs for a couple packing light, or 1500 lbs for a family. Trailers with a net carrying capacity in that low 1000 lbs range means that you are always on the edge of being overloaded and dealing with associated tire and axle issues.
Having a 3000 cargo capacity means you have plenty of headroom on the tire and axle ratings with a stronger frame etc., and are less likely to have weight-related issues down the road.
As was said, what matters relative to the TV is how much the TT actually weighs, not what the GVWR is.
A general guideline would be to add 1500 lbs to the dry weight of the trailer to give you an estimate of what it will weigh going down the road. This accounts for batteries, propane and gear, but not fresh eater on board.
