On long (eg mainland European) trips, we carry cam belt (& fitting kit), regulator, a fuel pump (now hopefully superfluous with the recommended upgrade to a Wabro one), some spare exhaust nuts and the rubber mounts for exhaust/regulator. Now we have done the wonderful Bleazey mod to the drivetrain, we could also take spare inserts for the centa-coupling.
Not all can be done at the roadside but better than being trailered home if one has the (hard to find but potentially vulnerable) bits required to fit at a friendly local garage as an alternative to a trailer trip home.
