The difference between single or double axle is:
With a double axle if you cut a curb short and run over it you may overload the single axle and this could bend the axle and cause the tire to be leaned out or in. This will cause the tire to wear prematurely; where as the double axle the other axle will help carry the weight.
With my tractors and mowers I have found it's cheaper in the long run for me to buy only double axle trailers in lieu of buying 1-2 sets of tires every year for a single axle.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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