What!?!? Too much trailer and not enough truck, again?!?
Weighing it will give you all the answers to all the questions. Based on what you have said you will be close.
Just an observation: Why does it seem that people get a rig and then try to tow it with the smallest vehicle they can buy?
My BIL has a Silverado 1500 4x4 and wants to purchase a 5th that has a hitch weight equal to his truck's payload. If his wife travels with him he will only be able to travel about 10 miles before having to refuel to stay underweight. Being a couple of lbs. over around here means no insurance if you have an accident and no chance of buying it again. Travel without purchasing insurance or set up so you through your money away because it's invalid just doesn't make sense.