Laura, I'll give you my perspective as a guy who for the past 25 years has ventured into the outdoors mostly solo.
Don't recommend it to anyone but the most confident and cautious.
Even then, One takes a risk. That being said, when I go out I am prepared.
Now, as far depending on a older vehicle is concerned, it really depends on the vehicle condition. If you are certain it's "up to" the trip-no sweat. But if you have question, it's better not to risk getting broken down miles away from the nearest repair shop. Being 'between jobs' myself, I plan to do a solo road trip along the southeastern coast staying in campgrounds and hostels starting the next couple of weeks.
Best wishes and enjoy your travels.

Ellis "outdoorman"