On my '08 210WSB, if you use the disconnect to isolate the trailer load from the battery, you also isolate the TV's connection to the battery. On mine, I actually took the black cover off the unit (where the disconnect is mounted) in order to a) see what the heck was in there and b) to fashion a guard for the darn switch so that stuff moving around in the pass- through wouldn't bump the switch into the "disconnect" position. My switch is wired across the hot line from the battery as it comes up into the trailer and the main bus for the 12v system. This is also where the 7pin connector's wiring enters the "system". The disconnect is between the TT's wiring bus and the battery's hot cable. Disconnect is a true disconnect. No battery connection to anything except the ground to the chassis.
Using the disconnect on mine is the same as removing the battery from the TT. Utter and complete "disconnect". Not even the breakaway switch is connected (another reason for my making the shield to prevent "accidentally" disconnecting the battery - keep the battery in the charging circuit and keep the breakaway switch powered). I made a "U" shaped shield with ears out of bar aluminum ~2" tall and pop-riveted it to the black box. I can reach over it to manipulate the switch, but, it can't be accidentally activated by anything sliding into it.
My 2 cents, your mileage may vary...
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)