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I actually have a small scissor jack from Harbor Freight but I don't carry it around...maybe I would if you guys have a reason I haven't thought of so my question is genuine.
How is this for one reason:
Have flat, you can remove tire and take it to be repaired or tire replaced (leak to large) and not need the car towed!! I do not have a whole lot of faith in tow drivers and would worry that my car may be damaged. Also no one can drive the car away while your getting it fixed with a missing wheel if you do need to take it somewhere to be fixed and have to leave the car unattended for awhile.