I'm not familiar with your RV but if you have a black water flush you need to blow the water out of that and also in the city water connection you need to carefully remove the little screen and stick you finger in the opening and release any water that is behind the check valve and then put the screen back in. If you have a water filter system you need to remove the filter and drain that. Sound like you don't have that though.
One more thing if you have an outside shower don't forget to run anti-freeze through that. Like I said I don't know how your RV is equipped, just trying to cover all the bases.
Other that that you have it done correctly, nothing to it.
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23
Camped 2015 - 47
Camped 2016 - 51 done - 6 more planned so far