[Antennas] simple 160 ant.

[Myles]

In all my years on the air, I have never been on 160. I would like to try it this winter, but not looking to spend a great deal of time on a complex antenna. I just bought a set of  Unadilla KW80F -  80 meter  traps. I have an 80 meter inverted V now - apex at 70ft, I have trees that will allow the longer wire and will have the ends about 30 feet off the ground. I know this is not the ideal antenna, but it should at least get me on 160. 

My questions are:

 Do I make the 80 mtr section longer or shorter when using traps ?

Do I make the overall length as if I were building a dipole for 160 ? 

Would I be better to just make a separate 160 inverted V and forget the traps ?

Is the formula (468/F) correct for a trapped dipole/inverted V ?

Any comments would be helpful.

Thanks,
Myles - W1IKO