Rear gear question

[72kool]

Since the wifes new(to us)vehicle broke down (long story on that) i am now daily driving my truck again. I am very happy with this and would have all the time but couldnt justify letting a vehicle sit that cost me money monthly unlike the truck. Any ways, i will be driving my truck everyday for a few months til next spring. It is a '72 C20 with 4.11 rear gearing. i drive 7 miles to work and with our winters here i would like to change the gears from being a one-wheel-wonder open diff. for better traction when its not so nice out. This was built a work truck when new and still is so i do not want to compromise that. I pull a trailer from time to time also. what is your opinions? what are you running or had good luck with? ive done some research and liked the sound of a powertrax system. are these suitable for my needs?