The weights all depend on your GCVWR; combined that is, get your van towed and that will determine what's left. Remember that after you buy a TT you will be adding ~500 pounds not including any water that you may carry if you elect to.
Remember that the weights on the yellow sticker represent dry weights and may not be the real weight. It will not represent any options, aftermarket or other things added after the sale, that is if you are buying used.
Grab the sticker on your door post and have your van weighed. That will tell you what the true weight is and what your max gross combined weight rating will be. From there you can determine how much TT to buy.
Remember, lawn chairs, grills, kitchen utensils, bedding, fresh water hoses and the like all add weight.