Schedule 80 is way overkill....and much, much heavier. You can still use schedule 40, just use the class 200. I have seen the class 160 split easier than the 200 under stress. You might say, "what stress?" Well....who knows. It depends on the kinds of roads/trails you run. Also, sunlight has a long term detrimental effect on PVC....and in that case you might want something thicker too. Why not spend a little more for the initial investment for potential longer term durability? It's not like it's 10 times more expensive. Wait, now that I think about it.....I wonder if they even sell it in 1" in a class 160 anymore? You might not have a choice. We always get class 200 for irrigation purposes regardless. Go put two sticks of them together and you'll see the difference.