Fair enough on the leaves and pine needles. I was presuming if it is snowing that the leaves would be gone and most of the pine needles blown off as well.
My reasoning was if the doors were not present and if the cover was shorter there would be air flow do the bottom of the cart.
Oaks keep most of their leaves into the winter and pines shed in the cold weather.
I have 2 grills with cabinets side by side uncovered on a composite deck. Half sun and half shade. Doors closed. Drip and catch pans emptied and cleaned periodically. I have been watching them for 6 years now.
#1 - 2014 Genesis 330 with tank in cabinet - no noticeable rust or rot. No debris - somewhat clean.
#2 - 2012 Spirit 3 burner - 4 years tank inside. Last 2 tank outboarded - thanks for the idea. Some minor rust but no rot. No debris - somewhat clean.
I have had about 300 Webers - Gas and Charcoal in the last 8 years. Probably 175 of those were too far gone for refurbishing. Ok for some parts. I stick to free grills or $20 tops so I don’t expect showroom conditions.
I do make an effort to learn about their history and where they resided. I’m nosy but I don’t want to send something with an issue that can’t be fixed to a new home.
Common themes on the bad ones.
Covers didn’t matter if you had these things going on.
Not stored in a shed or garage
Not under a roof - like an outdoor kitchen roof
No maintenance
Full shade in the open
Close to a pool
On concrete without a grill pad
Proximity to Oaks and Pine
Wind damage
Falls
Fires