I think I will worry about summer in about 2 months
But heres what I do.
Here is what I did and it worked for 4 years and 6k miles.
Fill the tank all the way up with 91 octane.
Fill the oil reservoir all the way up.
Put in stabill.
Pull the air box.
Fire the sled up and let it run 10-15 minutes to get the stabill down to the carbs.
Use the spray oil (I can't for the life of me remember the name of the stuff but you can get it from any dealer). Spray directly into the carbs. One, then the other. Spray a liberal amount into each carb. Then spray enough into each carb till the engine dies.
Pull the plugs and spray a liberal amount into each hole. Then slowly pull the engine over to distribute the oil. (don't start it, make sure the key is off)
Put the plugs back in.
PUt the airbox back in.
Spray line lube into the throttle cables.
Remove the drive belt and toss it on the shelf. Lay if flat, don't hang it.
grease everything.
Elevate the rear of the sled and remove the torsion springs.
I like to block up the front and release tension on the front springs.
Armour all the seat and call it a year.
When you go to put the sled back in service in the fall syphin the gas out of the gas tank and run it in your truck. PUt fresh 91 octane fuel in the tank prior to starting it up to burn out the oil.