Any recently wired RV, should be wired in a way that mimics the wiring in your house. Take a look at the breaker or fuse box in your house. Power comes in through a central line. It goes into main disconnect (breaker or fuse) sized to protect the central line in. Breakers or fuses are installed for various circuits through out the house. Estimates for how much power each circuit might need drives the size of wire run through that circuit. The distribution breakers or fuses are sized to protect the wire in those circuits.
If you feel it is OK to just run a line into the TT and tap into it in various locations around the TT, you are heading down a dangerous path.
Finding a quick read about basic household electrical on the web or at the library might be helpful.
