I guess it depends on how you use your camper. For us it is the only real option besides tent camping as we often have something in tow or go off road where a TT wouldn't work when we camp.
If I didn't do either of these things, I would have a TT over a TC.
IMO it rarely pencils out financially to have a separate commuter or car pool vehicle in your case vs the cost of owning and running a big truck or SUV as your sole vehicle.
I personally could not live without a pickup but if you're considering leaving the TC on the truck full time then that is not a concern for you.
So best decision financially is to get a SUV that will do dual duty. A minivan will not save enough gas plus all the other costs to justify. Unless the school commute is a long distance. Even then you'd have to run the numbers.
You mention a tent trailer though and most real minivans could pull a tent trailer easily so???