Congratulations! Please share photos of your project.
Never ever use the "dry weight" to calculate towing. It's a fictional number. You will never tow the trailer at the dry weight when ready for camping.
Originally Posted by GrumpyDad
What's the gvw of that trailer? That's what it'll weigh going down the road, or closer to that then the dry weight.
Load it up and take it to a cat scale. I'm guessing you are over your payload, tongue weight, axle weight or maybe all three.
I concur. That's a big trailer. Ready and loaded for a camping trip you'll be a lot closer to the GVWR. Calculating your tongue weight (10-15%, I always use 13% because that's more realistic than 10%), your "dry" tongue weight is 624#. When you load the trailer your tongue weight will increase.
Look for a sticker in your driver door that lists the payload. Subtract from that number the weight of your family, anything you carry in the truck, and the weight of the WDH (usually around 100#). The final payload # will determine how much tongue weigh you can really support.