I'm worried about getting that highlift jack off there without breaking the windshield. Who puts that there?
I've taken to calling all the crap people bolt to their vehicles as "flair" paying homage to the movie "Office Space". It seems really out of control these days, since it seems it's more for appearances than purpose. Specifically on those jacks, I've always found a way to store it out of the weather since I've seen them work poorly (or not at all initially) due to being stored outside. One of the reasons I carried a can of WD40 offroading was to lube up others' jacks so they'd work when needed.