Francesca hit it right about claustrophobic. If you feel you will be, then you don't need to consider this for any length of time. We had a 31' TT and now a 31' Class C. The Class C is set up better for us. The TT had bunks in the back that was a waste of space as we have one kid. Our bedroom is bigger. Even if you got a 30' 5th wheel, you are talking less than 300 square ft.
Speaking of 5th wheels. Not all 5th wheels can be pulled by 3/4 trucks. Your selection of a 5th wheel will be limited. I can't remember if in your initial posting, but did you say you were going to pay cash for the camper and tow vehicle or motorhome? Or is that all included in your depreciation number?
If not a class c, then I would look at a 1/2 ton truck and a smaller TT (something under 25'). I would budget at least $15k for each. And stick with models not much more than around the 4yr area.
Seeing that you want to do more dispersed camping, I would consider even smaller camper if you can stand it. One thing us campers do, is try not to spend much time inside the camper. If the weather is good, you put out the awning, throw out the rug and sit in your chair outside and enjoy the wide open space. Inside is left inclement weather and sleeping. We even try to do most of our cooking inside.
Also be aware that when you look at used campers, you will come across some bad smells. You will wonder what the hell they have been cooki in there or what died in it. Lol