Keep an eye on the ladder mounting points since you've added an additional load to the ladder (i.e. cyclic fatigue loads while driving down bumpy roads/trails) The weight of a man climbing on the ladder is greater than the weight of the jack, but it's a static load.
I have a Gobi rack with rigid LED's front and rear, with wires routed through the shark fin. It was "professionally" installed. However, there's no way to remove it since there's no external connector in the wire harness. Keep this in mind during your installation...you will eventually need to...
With the key off, press and hold the reset button.
Turn the key on while holding the reset button until the display flashes all zeros.
Release reset button.
Turn key off.