How wide?
Great question... 6" ?
Cost, for one.Why didn't you just put duals on it?
Second, is that with duals, your effective width changes dynamically with the ground contour, as a high spot might contact only the inside wheel, vs the outside wheel. Such as going over a rock on the highside, and suddenly your effective width shortens by a foot and the CG swings quickly.
Or at least that is my understanding.
My land is all slope and rocks, so really just trying to maximize the safety curve. I've had this tractor for 8 years on the hills before the spacers - can't wait for things to dry off a bit and see how much it re-calibrates the pucker meter.