I just start the motor once a month in the off season, let it fully warm up to burn off any moisture, and kill it again.
Fogging just makes things hard to start in the fall. It doesn't hurt anything, but I can't see any benefit to it either. Some people act like if you don't do some specific procedure to a motor it won't run in a few months.
The motor(Suzuki 450) in the bike I bought recently hadn't been started in over 20 years, being stored in a shed after a minor crash. No fogging, no storage procedure, no gas stabilizer. Within 5 minutes I had it running again. All it needed was a new battery. It ran just fine on 20 year old gas. It ran a bit rough at first, but after about 10 miles of riding it cleared up, now it runs like a top. Didn't touch the carbs. Didn't touch the plugs.
But then again, the inline air-cooled GS series engines will run for eternity anyway, and so do these Genesis motors.
If that started after 20 years of storage with no problems, I don't think storing your sled motor for 6 months will pose a problem.
Oil change? When it gets dirty. I've got like 1200 miles on this oil and it's barely darker than the new brown color. Castrol 0-30 Syntec full synthetic oil. I guess you can do it every season if you want.