A camp trailer is warmer in cool weather and it's nice to sleep on a mattress...never could stand those air mattresses. Cots are okay but you've got to set them up along with the tent and everything else. An insulated trailer keeps out a lot of noise, too. A built-in or pull-out stove is nice to have. Pots and Pans and cutlery, etc. stays put in the trailer drawer or cupboard and you never have to worry about packing a ton.
When I was tenting, I bought a large tool chest on wheels and kept all my kitchen pots and pans, utensils, etc in it and strapped the camp stove over top of it with bungee cords. I still use it but now it is my food pantry. Everything else has a place in the trailer. (Even the tool box pantry goes in there but is rolled to a bear box in bear country.) If you put a pass-through between your galley and "bedroom", you can have coffee/tea in bed before you get up.
The convenience of push button lighting and lights outside each door is nice. I remember someone writing about hearing a noise and opening the door only to come face to face with a bear. If you have a light on the outside that turns on from the inside, you can look out your window to see what's going on. With wiring, you also have the option of exhaust fans as well as other fans in hot weather.
With a tntt, you'd still have a problem of where to put the kids if you were in a "no soft-sided trailers/tents campground but I'm guessing that would be rare enough that you could stay in a cabin or rent a larger motor home for those trips. Tents just wouldn't work for those stays, regardless.
A couple disadvantages of a trailer are that a tent costs less and a trailer takes a while to build, unless you buy one. You learn a lot, though, and you end up with some really good memories and knowledge. I still am amazed that I built a camping trailer but I'm glad I did! It's now 11 years old and I'm 75 and we're still kicking around together, having one good time after another. Like an old married couple, we may just be together 'til "death do us part".
