I just saw a 6 person landscaping crew in a big chevy 2500. 3 big dudes sitting in back - there is more than enough room to seat 3 kids back there. I'm not sure how you can get away without having a pickup if your talking about a fifth wheel.
So IMO, your choices for towing your current TT are to get something that will work, like a van or used late model crew cab, or sink some money into your current TV which is showing it's age. Nothing is impossible without the accompanying cash-flow. Which reminds me of something I posted in a similar thread:
As Spock would say - "There are always alternatives."
The bottom picture is way cool. Wish I could do that. Good luck