Will a twin bed frame fit in a car?
If the twin bed frame is fully built and cannot be taken apart then you will have no chance of fitting the twin bed frame into a regular size car. If anything, you are going to damage the twin bed frame and then if you try to fit a twin bed frame into the car. Also, if your car is not long enough, you will not be able to close the doors of the car if the twin bed frame is too long for the car to handle. Since you are not able to close the doors or just the trunk/boot of the car it may be dangerous for you to drive with the twin bed in the car as it may fall out damaging the twin bed frame. As a result, you may have to buy a replacement for the twin bed frame costing you more money than it would have been to hire a van to take the twin bed frame for you instead.
If you were to disassemble the bed frame first and then put the parts from the twin bed frame in then you would be able to, but not with all the parts in the car. Even if you try to place the longer items from the bed frame at an angle the longer items will not fit if the car is not long enough to accommodate them.
How do you transport a headboard?
To transport the headboard of a bed, make sure if you do not want the product to have any damage when being transported wrap the headboard in plastic to make sure that it has a layer of protection on it. Also, make sure that the screws and bolts for the headboard do not go missing so place them in a little box or bag for safekeeping. If you really need to be safe with transporting the headboard hire someone else to do it when you are also moving the bed frame or have someone else help you instead. If the headboard is heavy and could break easily have two people carry the headboard to make it easier.