Those poly plows are great, and they are light and snow doesn't stick as much as the metal plows. Doing what you say you are going to do with it is just fine. And it is always a good idea not to run like a tiger down the road plowing out the neighborhood because it will wear a lighter truck like that out faster since they are considered light duty trucks.
Also know that when you run down the road with those blades on, you can heat that truck up fast because it blocks the air that normally cools the radiator. So put the blade an an angle if you are going to drive any distance.
Never hurts to have a tranny cooler, but a gauge will tell the tail and then a good after market cooler could be added if you see the temp rising especially in mild weather conditions.
I bought a 3/4 ton 2500 gmc, and put a 7.5 polly on it and it did a terrific job but it was way more truck and plow than I really needed. I installed a western on it and even with the torsion bars cranked 3 notices it still dropped the truck when the plow was lifted. I had a hard time deciding on whether to go with a western or boss, but I decided to go with the western because you don't have to run around "looking" like a plow truck when the blade is off with the western, where the boss had brackets hangin down all the time. The plow worked great. When I sold it I got nearly 80% of my money back because it looked like new with the polly blade. So it turned out to be a great investment for the 4 years I had it.
Much of the plow equipment out there is very well refined and if you take care of it, they are good investments in the long run.
I would NOT shy away from putting a plow on anything anymore. Lighter the better. One or two extra passes is not an issue unless you are trying to make a living at it.