Agree that you start with the VIN and get all the specs on the vehicle. Then you can start to sort out the rest of the numbers. It can get very confusing, so don't hesitate to ask or ask again. Also agree that one 24' trailer is like not even close to another 24' trailer....too many variables. Get your numbers first and then start the search. Remember, you need to include passengers, cargo, etc and with the trailer, suggest you don't even think about the dry weight since there really is no such thing. That would be like a trailer without any A/C, battery, propane, appliances, awning, etc.....just sort of a bare shell of a trailer. You'll get lots of help sorting this out, just get all the specs on your cargo van first. Good luck.