Can I ask what size you elected to buy please? And if you were buying again would you go for the same size or larger?
I have been thinking about something like this as I have a 3 bay garage (open between cars) with sliding doors that is impossible to insulate effectively and I suspect that even a dehumidifier wouldn't work because of the severe lack of sealing etc. Seems the only way is to put the car in some sort of sealed environment as you have done - and glad to hear that your solution is proving effective.
