I maybe misunderstanding some of the posts but I am not sure why you would care what the GVWR of the trailer is. Rule of thumb is always the bigger the better. It is a rating not a weight. However you should be looking at net weight and then calculate realistically what you will add including everything that goes through the door, goes in the tanks and gets put on the tounge. Leave yourself a little leeway and make sure you do a test tow before buying. You will be able to get a good feel of how it pulls even if it is empty but have the delaer fill the water tank to simulate at least some of the weight.