I bet since you put that lot in the back, you've never bust a half shaft! As soon as you take it out and leave it at hoe, that's when disaster will strike.
Quite right - carry the kit and you won't "breakdown".
I too use plastic pipe to store the halfshafts in
When my halfshaft failed in France I was resigned to completing my trip on the front axle.
However, a Swiss owner lent me his spare shaft and so I did the field replacement - at night, on wet grass.
Since then, when away from home I carry spare halfshafts. Not so much for me, but in case another owner "breaks down" and I can return the favour !
Prudent owners should be carrying some basic spares on board.
To include:-
Fan belt
Points
Rotor arm
Dizzy cap
Condenser
Spark plug
Wiper arm & blade
Rad hoses & clips
Various light bulbs
These are relatively small items.
Even if you are mechanically challenged - the spares will help a good Samaritan fix your vehicle.
No doubt some other parts could be included
Wheel bearings with lock tabs.
etc. etc.
If I venture out of Norfolk then I carry this sort inventory.
Round Norfolk, I don't bother.
To me a breakdown is when the head gasket blows, or the sump drops off, or a wheel falls off and you need the big yellow taxi home - something that can't be repaired at the roadside.