[Grammar] "would have been" or "would be/been/had been"?

[amk0300]

In 2003, he was traveling a lot and a car would have been a good thing for him.
In 2003, he was traveling a lot and a car would had been a good thing for him.
In 2003, he was traveling a lot and a car would been a good thing for him.
In 2003, he was traveling a lot and a car would be a good thing for him.

Now he is not traveling anymore and he has a car.

Would you be so kind as to tell me, which one is correct?

Thank You so much!

 

[Grumpy]

"Would have been" is correct. Also, please note the correct spelling of "travelling"

 

[MikeNewYork]

Ahem! "Traveling" is the correct spelling where I live. ;-)

 

[Grumpy]

Ahem! "Traveling" is the correct spelling where I live. ;-)

Is it really? Extraordinary......
Harrumph!