Hey Bill I'm with Stretch on the dual axles. 13" tires with duals is great for the 20'er, if you go single you will have to go with 14" tires. Last time I put springs on my trailer for the 23'er I upgraded to the 2000# springs versus the original 1750# springs, what a difference. It is more stable and tows much better. A lot depends how far and how much you trailer, to and from the boat ramp at let's say ten miles a single is OK, towing long distance go with dual axles.
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