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If replacing 1 x set of leaf springs, its always best to replace both sets (on same axle) at same time. Unknown to some, not all leaf spring sets are the same. Using leaf spring set from company A and leaf spring set from company B on same axle will have different flex behaviour. Bad thing to have on same axle. Thus, best to buy matching leaf springs sets.
For me, I always upgrade to next size up when my leaf spring packs need replacing. For example, if factory leaf sets are 3,200 lbs, I upgrade to 3,600 lbs sets. If leaf packs are 4,200 lbs, I upgrade to 4,600 lbs sets. Always next size up. Their extra buffer allows for those double rail-way tracks and end of driveway bumps. Is "next size up" that rougher? I've never noticed a difference. Especially since (IMO) most trailers are built within under sized leaf spring packs at factory (to save them build costs) anyway.
If it was my trailer, I'd upgrade all 4 x sets and go "next size up". And to make smoother ride, I'd replace the factory solid Yoke system with new technology smooth rid system.
Something like:
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