Mine sits in an unheated building parked on plastic.  I put Stabil in the gas tank and have the tank full, then I pour a little ATF down the carbs while it's running to fog it.  Then off for the duration of the endless salty WI winter.  No cover.  I flip the sun visors down in case a mouse would get in.  It smokes for a few miles in the spring, but no issues, otherwise. 
It's unknown how long mine will hibernate this year since I broke my clutch leg and foot in 2 places each this morning.  Mucho ligament damage, too.  

  I'll see a surgeon on Monday.
 
View attachment 1803013