I think it depends on how you plan to use the TC. If it is for sleeping and traveling, it could work. There are people here who do it. You might be a little crazy sitting inside for extended periods of time, but it would be better than a tent by a long shot. And, even the largest TCs are still small.
As far as what your camper will haul, you said 6.0 which is relatively light weight and gasoline, so you have some room to work with for weight. Putting it another way, they rent Lance 650s on F150s. Your truck is way more capable.
One slide would be helpful for floor space to give you more floor room, or a tent fold out would help as well. Both are available although you have have to look around. You can add a bunk yourself or buy one with a bunk to go over your dinette.
At the end of the day, if everybody fits in the front of the truck, they'll fit in the back.