RV storage - how much room is needed?

I wouldn't waste the time and money if you are not going to use it as a garage. My opinion is that there in more damage to an RV during hot summer months than cold and darker winters. My trailer is indoors whenever it is not in use.

I put down marker tape on the floor for guidance when backing in so that the trailer is located where I want it. The idea of a larger door is good so that you can make the fine adjustments with little interference with traffic.