Congrats Frank, enjoy!
A few things you have to be aware of when looking at weights. While the truck has a 8k trailer rating, it's the cargo capacity and axle ratings that you need to be aware of. Also, TT dry weights are without A/c, propane tanks (duel 30's usually) or batteries. Remember those are on the tongue of the trailer and are almost 1:1 for calculated weight.
Try this once:
1. Get GVWR of truck from door jamb.
2. Fill up gas tank, load up family, put in WDH insert into hitch and head to scales (local elevator charges $5-$10, or find a local CAT scale at rest/truck stop.
3. Weigh truck (if able, do each axle - CAT scales can do this). You can use this info for WDH setup.
4. Subtract scale weight from GVWR.
5. Output is cargo capacity left on truck.
You will end up around 1k (aka 1/2 ton capacity). This is the amount of weight, per the manufacturer, not a legality number if in a wreck, that you can still add to the truck.
6. Subtract TT tongue weight.
7. The number you are left with is what you can now put in the bed (firewood, coolers, bikes, chairs).
Now, this is the manufacturers recommendation not to exceed. If exceeded (we all see it all the time), then bushings,bearings, shocks, brakes, etc wear out prematurely. Not the most stable ride, but the truck will have plenty of power and stopping capability.
The issue with a 1/2 ton as you approach 7k is not just cargo capacity, but also GVAWR (axle weight rating). This is a legal number that you cannot surpass. With a family, I feel you need to be very aware of this. All the add-ons you listed will help in the towing experience but weights are the most important, even if just hitting the local campground. No reason to go out and buy a new truck, but be aware and do due diligence when you get the unit. Load it up and take it to the scales and do your WDH set. If you want a sure way of getting tongue weight, Check out a sherline scale or bust out the bathroom scale and a long 2x4 and your statics book lol.
Try different loading techniques with all of the outdoor storage you were looking for. You'll be amazed if you weigh everything that you put in the trailer...1k plus easily with kids. Remember H2O weighs 8.3lbs/gal, so there's another couple hundred pounds. Depending on H2O tank location (behind, over, or in front) of the axle could add tongue weight. If any questions on what to weigh in what process with the unit to setup the WDH at the scales, just ask. Keep the tongue weight in the 10-15% range (ready, the light bulb should have gone off....say 6500 fully loaded, that's 650-975lbs.....there goes the 1k cargo)
I apologize if you know all of this already, but most don't so I felt it was important to add to this post.