I have an Optimate 6 trickle charger which is connected always if the car is left more than a day as it helps prolong battery life.
Dehumidifier is essential for keeping bright work shiny, and preventing rust elsewhere, it is also better for keeping wiring dry etc.
A good indicator of this is whether or not your brake discs show a bit of surface rust over winter - if they do the garage is far too damp.
I try to keep mine at 60% RH all year around, and even in the summer this is not possible without a dehumidifier.
For winter storage you can pump up the tyres to protect them from flat spots, or buy tyre "shoes" which you park on.
Regards,
Nick
