The chargeguard is to maintain the vehicles battery - either while plugged into an AC circuit at the garage, or to keep the battery from running down too much from accessories.

The Gamber-Johnston is a docking station for a Panasonic Toughbook CF-31, a ruggedized laptop. You can pick them up refurbished on ebay for a couple of hundred bucks....they make great computers for digital radio communications.

The Wilson is an amplifier...I'd have to see the label to see what freqs (possibly cellphone?)