The TV is one of the 120V appliances which will only work when the coach is connected to shore power or by use of the generator.
The extra pair of wires are for use with satellite connections.
Page 101 of the owners manual covers the lubrication process for the antenna. The crank raises and lowers and the outer nob rotates the antenna. This allows adjustment for best reception.
The low point drain is used to completely clear the fresh water system.
It's possible to install an internal filter but an external fresh water filter is just as good.
Regarding the Ford chassis. I don't doubt it's louder than the Chevy but I don't find it bothersome. Don't let the noise level cloud the fact the engine produces more torque than the Chevy and that's one of the most important factors when you're driving a small house down the road. I wouldn't buy the model I own until the dealer secured one with a Ford chassis.
2014 Thor Chateau 22E Class C
Ford E-350 SD DRW 158" Chassis w/6.8L V10