I occasionally have to take my tractor onto the road to get from one property to another. Partly because of a chronic problem with my OEM flashers (they keep shorting out), I decided to add a separately circuited set of flashing beacons onto the light bar I built for my tractor.
I just finished installing them, and I have to say I am really impressed by the product. They are sturdily built, and include a flexible base mount that allow the beacon to take a modest hit (tree branches, etc.) and not get damaged. The LEDs are more than bright enough for daytime visibility. And the entire device uses a quick attach system that allow you to remove the beacon without having to remove the base bracket from the tractor.
You can get these on Amazon or at any other online superstore or parts place.