The most important factor when selecting an axle is the weight capacity you need. You want to ensure your completed trailer's fully loaded weight is less than the axle capacity, or that it at least matches. Axles of a given weight rating will tend to have specific hub-face dimensions and spring center dimensions. You can use an axle longer than the trailer's width but spring centers must match your hangers. This really depends on all the details of your starting 4 x 8 trailer.
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