Another thought: I recently purchased an older camper that originally came with 14" tires that needed to be replaced.
I quickly discovered that 14" tires are no longer as common a size as when the camper was new. After some careful measurement, I determined that current 15" tires and wheels would fit my camper without modification (i.e., same bolt pattern and there was enough clearance).
If your trailer can handle it, I highly recommend this approach: I got tires with a higher weight rating than 14" tires. Another reason I took this approach: If I were to need a new tire while on the road, I'll likely find 15" tires in stock without problem. 14" tires can still be found, but I suspect many tire shops will have to order them.