Here is a web site that is helpful -- RV Tow Check | Salesperson Fact Checker
Do you really need a TT this big? Or are you just wanting a newer truck?
Do you travel far to a campground or just close by? Do you intend to travel with it or is it just for local weeks/weekends and maybe just parked somewhere? How much stuff do you think you need to camp? I have downsized our camping items three times and every season, find something else that I have never used and we leave it behind.
Kids mean a lot of extra stuff but how much extra stuff?
Load up the truck with what you think you will carry in it -- passengers, chairs, bikes, coolers and go weigh it. Once you get the weight, maybe some of that can go in the camper or not go at all.
We don't carry water in any of the tanks. We don't carry a lot of groceries either. Always a store nearby.
Will you really load up that much stuff in the TT or can you be frugal to keep your weight down?
There are so many other things to consider when buying a TT.
Just my practical two cent thoughts.