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Which works better for trailer stability: having a wide axle with the wheels far apart or having a narrow axle with the wheels close together? And whichever way is better, WHY?
Mary, I think we can apply the same principle from sports cars with excellent road gripping abilities. The wider the wheelbase, the better.

I do beleive is the wheel base is wider, the center of gravitiy is stationed towards the center and barely shifts. If the wheel base is narrow the center of gravity is more substantial to shifts, left right for and aft.

Also another thing that works good with trailors is to have bigger wheels/tires. Bigger wheels and tires will lessen the rotation on the bearings. Making them rotate less, causing less wear and tear through reduced heat.