To me, dry weight is important because TT's have such a wide range of cargo capacities and no matter what trailer we go with, the number for us isn't going to change much. There are some TT's with a 950 cargo capacity and some with a 2000+ pound one. The one that has 2,000 pounds could very well be in our weight limit since we won't be hauling 2000 pounds. I hope that makes sense.
I appreciate your advice as to handle the sales people.
Nobody is trying to lecture you here. However, think on this. Water in the tank is 8.3 pounds per gallon, some water in the grey and some in the black tanks is a considerable portion of the available payload capacity. Then you add for all your stuff and pretty soon you will find that the empty or dry weights you are looking at are pretty close to the gross weights. Most small and light trailers have less than 1600 pounds between gross weight and dry weights. Water takes up at least a third of that capacity, (50 gallons is 400 pounds) then add 500-600 pounds of stuff, maybe another 100-150 pounds added in the grey and black tank and you are not really that far from gross weight. That is why so many just use gross weight for the calculations.
I hope you find what you are looking for in the size that will work. Just remember that you will load the trailer with more stuff than you think you will and it gets heavier with each trip. We have all been there.