trailer winch

Thanks guys . I pulled a 4x4 dodge up on the trailer a few yrs back, the "guessing" 2500 pound winch was a little weak. It felt a little weak back when I sucked a wrecked Taurus up on it that had the wheels knocked almost off.
I have a pair of 6-8 gauge wires run from the front of my ram to the back , w/ a heavy 12 volt plug in mounted to the bumper, and alligator clips on the front , to hook them to the battery, only when I use it , has worked "good?" so far ---.
I`m thinking a little stronger winch , like I mentioned earlier , 5-6000 pounds . It has to be weather proof too, may set in the okla. weather for 2 yrs. w/o being used------------
I don`t use it often, but when u need one , u need one . BOOMER !