Was looking through the forums and seeing all these complicated instructions on how to root your optimus v device and decided to post this for the not so tech savvy users. Note rooting has its dangers such as bricking and voiding warranties wich i am NOT responsible for. You proceed at your own risk. Please read COMPLETELY BEFORE ATTEMPTING ROOT.
Heres what youll need. An internet connection, your phone, and its web browser. Thats it, no computer, cables, etc, etc.
First go to settings > security and check unknown source. Then open the phones browser and search for stumproot.apk download and install it from a trusted source. (I believe theirs links floating around on here somewhere if your dead set on finding one thats trusted by others) once installed open the app and press the grind button. You will most likely get a popup saying your device isnt natively supported. Just press the force root button. Your phone should be restarted after its done.
Once your phone starts back up go to the playstore and download supersu by chainsfire. Open it and you will be prompted to update. Press the normal update button and wait for it to update, in the mean time go ahead and get some root tools from the playstore. I reccomend root browser, and a backup tool such as titanium backup. Also grab rootchecker as this is how we will verify root.
Once supersu updates restart the phone again. (Reccomended by supersu's distributer) then open your root checker. You should get a popup asking you to grant rootchecker root access. If you get the popup congratulations you have rooted your device.
After this delete stumproot from your device. (Again reccomended by apps distributer) and set up your back up.you can find several guides on this topic depending on your chosen backup manager. Remember some managers can flash roms and/or do other actions that could brick the phone if not done properly so make sure to read any/all instructions carefully.
This method has been personally tested and confirmed on my optimus. Lg ls720ZV8. this can be checked on your phones settings > phone information/about phone > software information > software version if your not sure what yours is.
Note tho my device runs on virgin mobile this method should work on a wide veriety of optimus devices and carriers.
All due credit to makers and distributers of aformentioned apps.