That trailer won't have a 643 lb tongue weight when loaded. If you load it to it's max of 9443, your tongue needs to be 10-15% of that. And some trailers are hard to keep at 10% (and most people prefer to tow with a tongue heavier than that). You could have a tongue weight of up to about 1400 lbs. More than your payload.
And ya half tons aren't great for towing big trailers. We just bought our F-150 last summer and I quickly found out that the model I wanted had low payload due to all the creature comforts. Typically around 1100 lbs of payload. So I discovered if I found one with the "max tow" option, I could get around 1500, so I found a truck with 1575. And once loaded with us and the kids (and we are light adults and the kids are still small) and loading stuff in the back, and our tongue weight of 770 lbs on a 5000 pound trailer, we have some payload left but are close to our rear axle weight rating (we went to a scale and weighed). As the kids get bigger, we'll be changing what we carry in the truck bed.
Our is a great trailer but I don't think it will meet your needs even though it has bunks. While we have 5 people camping in ours, it's different when it's your spawn that are with you as opposed to other adults. It would be tight for 6 adults.