Yep, I'd agree with this estimate. OP also needs to bear in mind that the car is four years old, so has probably lost about 15% of its battery capacity.Hi!
Rapid chargers have their own cable so you don't need to carry one.
I think you're a bit too ambitious about the range especially with winter weather and the heater on.
50 miles max in winter, 60 in summer. That's driving carefully (not necessarily in eco but no more than 60mph and keeping the heating and a/c on recirc if needed).
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This is speaking from experience, having owned a 2011 Leaf 24kWh for five years (purchased when it was three years old and sold when it was eight years old).