They wanted to get to the truck stop because Luciana was wounded and there were supplies there. Of course the only reason she was hurt is because they all got on a plane WITH NOT A SINGLE EXPERIENCED PILOT AMONG THEM!!!!!!
Yeah, but again, if this truck stop was surrounded by undead, bringing a wounded Luciana there and hope plow through the walkers? Admittedly there were much options, but...
So you had
1. No experienced pilot.
2. No planned landing area
3. Rushing to what they were told was a besieged truck stop because one of them was gravely wounded.
4. Lucked out that the kids were nearby and had a running vehicle that could carry them all.
Then Lois Lane has to go back to crash site alone at night during a zombie apocalypse.