I already have a tire repair kit and compressor that I move from vehicle to vehicle. (I got the tire plug kit for my motorcycle after getting a flat on a rental and paying for a $300 tow)
I'm planning to get a bottle jack for the Astro because with the lift and bigger tires the stock scissor jack isn't tall enough. (I have some blocks to space it up but that isn't the safest solution). I always replace the cheapo lug wrench in every car I own with a cheap 1/2 inch drive breaker bar and socket from harbor freight.
The question is if I want to carry a spare or just rely on the tire kit and air compressor. A full size spare fits under the rear hatch - GM was just too cheap to include the parts. If I could guarantee I would only get a flat in the summer the kit might be OK but I don't fancy trying to find and plug a tire leak on Mt. Hood in blowing snow.
EDIT: You have likely seen that picture already since you participated in the Bolt Forum thread it is from