How anyone could pack a literal ton of baggage/ food/ clothing/ etc. in a trailer that size is beyond me.
Knowing what I know now (which isn't a lot, but enough) I would rent a trailer that size for a week / weekend and see how that works out.
I would weigh what I was bringing as I loaded the trailer. When camping I would take stock of what I brought, see what I was missing that I thought was necessary to put in my trailer and make a list. Including tools and leveling equipment hoses etc.
It would probably cost you $1500 to $2000 for a week inclusive. Over that week it would give you some real insight as to what you need or want.
In the long run, you will know the gas consumption, the feel of carrying that with your truck, as well as the real life weights and costs your dealing with.
Heck, if your close to a cat or other weigh scale that would be optimal as well.
Best of luck to you both
