Good list!
In addition, I carry a small floor jack and short lengths of 2x4
Extra oil
Extra antifreeze
Small set of socket wrenches
Road flares
Water
Jumper cables
Extra light bulbs
Spare tuneup parts-- cap, rotor, condensor
Spare fuel filter
Pliers
Shop towels
Small funnel
Lug wrench
Seems like a lot, but most everything has been needed by me or someone else on a cruise, at least once.