I would imagine they are promoting a few extras to make 'winter' camping a little easier, but none of that means that you can't still camp in the cold months without them. Heated pads for tanks are o.k., but tanks 'freezing' is a relative uncommon problem unless you are sitting somewhere with much below freezing temps for a very long time, especially if you are already emptying your tanks daily anyway.
I'm not sure what an 'AT Tank Gate Valve' is, other than a normal tank valve.
'14 Thor Palazzo 33.3 compact diesel
KingTailgater2 Dish, 100w/5amps roof SOLAR, BlueOx, 100,000+mi since '14... US, Alaska, and Canada... GA, NC, now N AL : )