next project...rear plow

hey guys, i am working on a deal for a rear plow for my plow truck

im sure i can figure the mechanical part out (stay tuned for pictures) but at this point my main concern is the electrical
its a full sized truck and i intend to run the pump in the back, with no separate battery (the truck allready has two)

so im looking at running about 25 foot of welding leads to the back of the truck
would 4 guage be sufficient?