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Ease of installation and install time is going to depend on your experience and mechanical aptitude. Mounting and connecting the solenoids to the latch release rod should only take a few minutes. Then you'll need to run a set of wires through the boot and into the cab, connect it to a relay and then your activation system (alarm, remote, etc).
If you shave your handles, don't forget a backup system to get into your truck in case you lose your remote or your truck battery dies.
Yeah, that's good. It is easy to wire to an aux output. The relay for each solenoid will have 4 terminals on it- 2 for the signal, and 2 for the power. When the signal wire from the switch goes hot, it allows the power wire to go hot, with much more current to your solenoids. So all you have to do is slpice into the signal wire, and hook that up to an Aux output on your alarm. Too easy. Getting behind your dash, or wherever your alarm is installed is on you...