Key for property gates is maintenance and addressing issues as soon as they show up, not putting it off for later. You take good care of it, they'll last for a long time. You don't, they'll fail if automated in a very short time. Professional installation by a reputable contractor (who also will file for the appropriate permits) is also a good idea - nothing like the surprise court summons for installing property gates that don't comply with zoning laws.
Wow...man, you need a dose of freedom and property rights STAT! Visit one of the free states and take a break from all that worry! :-)