Really interesting question, Natalie, that raises obviously many points, when examined philosophically. can't get into all of them, but want to open a few. The first would be concerning the general relation between traveling and being alone. What is it to travel? it is, classically, to leave home, and thus to leave oneself, to leave everything about oneself that is familiar. As such, traveling is, ideally, an event of maximum decontextualization where everything that made one fit or belong in a context is to an extent gone. As such, by definition travelling is that which exposes one to maximum aloneness if this is to be defined as losing any contextual relation one has. To be alone is to occupy a space that is in excess of any existing relation to anything or anyone. At the same time, to be alone in this sense is also the state of being the most open to others, or exposed to others as unforseen possible new encounters, liberated from any preexisting connections one has to people and things which have been automatized, and become habit.
To live a life of automatized habit means that one has constructed an existence where the self is completely at home with itself, completely in itself, and as such, fully alone, yet in a different way then the previous one. This aloneness is not the aloneness of not belonging to any context and being exposed to the unforseen and strange, but the aloneness of being so fully within a context so that there is finally no outside, nothing which is not yourself. To travel is thus to try to exchange one aloneness, an aloneness that is also a maximum opening to others, for another aloneness, where one is maximally with others, familiar others, in such away that one is completely oneself with no outside. thus, to travel is to be alone in such a way as to be at the same time the most together with others, understood as possible encounters and liberation from being glued to oneself.
the second question in relation to this coming out of your description, is what is the difference between traveling alone in exotic dangerous places, versus going on a road trip, which is nothing but a voyage with no immediate sense of the dangerous or of a strenuous task to be accomplished. Is it that the dangerous voyage is something that intensifies this double sense of being alone/maximally exposed to others or is it something that actually is a defense against this, by giving one always things to DO, tasks to ACCOMPLISH, so as one still feels oneself as occupying some kind of familiar territory, that of oneself as a doer. I don't know. it might be that the road trip is something that makes you face your aloneness, precisely by not involving you with tasks, in a more forceful way, and as such, requires another defense, that of doing it several people together, a defense that one perhaps didn't need when one had dangerous tasks to accomplish.