The 'current' style of Float-On torsion axle has the torsion member inside a square galvanized tube. If you have the 'old' style axle (used 'til the mid-late '90s) where it is a hex shaped torsion bar that is exposed - you want to replace it asap. I don't have the calcs anymore but IIRC, going to the 13" tires would only lower the wheel speed about 15% or so for me and 14" or 15" would be really hard to install. Even for 13" tires, I would have had to raise the fenders and put a spacer on the bunks (fenders would have just hit the hull). Also I would have needed a spacer to get the rim farther off the hub or new hubs. Plus new rims. Decided the additional load capacity of E (1650 lb each) vs D (1320 lbs) would make me feel enough better. D's were on it but I think those were the wrong rating. Be careful if you stick with the 205/65-10 tires and need the higher load rating since a lot of them are load range C or D.
Update - just checked and saw that I was looking at 13" tires to get a 15% reduction in tire speed since it was too much trouble for 14 or 15" tires. The 13's were not worth it for me and bigger was making way too many changes but if you have the room or have to change the axles anyways, the 14s or 15s would probably be worth it.
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