Help locating multi wire plug

Hello everyone, I am in the process of wiring my roof rack lights and do not want to drill my roof or run the wire harness on the outside of the cab. I am considering drilling and installing a plug port on the cab mounted rear brake light because I can get the wiring inside the cab from there.
So i am looking for a pug similar to this one:
http://www.downwindmarine.com/Hella...-Plated-Brass-Water-Resistant-p-91001846.html

I have a total of 8 lights on the roof rack. I have them divided into 4 circuits. I want to be able to control them separately so I will have 8 wires from the roof rack. The plug shown above only has 4 pins. Even if I combine all the grounds that still leaves 5 wires. Any help would be appreciated. Another issue is the voltage and amps. I have run 4 hella 500s 12v/55w I think that comes to about 20 amps on one circuit. I then have two separate circuits that each have one LED flood light that is 12v/ 15w and pulls 1 amp. Lastly, I have one circuit that has two of the LED lights on it so it will have 2 amp. I guess I am looking for a solution that will handle 25 amps.

Thanks for the help