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for the 12v power supply to the brake controller tekonsha suggests 20amps for one or two axles, and 30amps for 3 or 4 axles. Is there a problem with using the 30 am breaker if I just tow two axle trailers. Would rather not under size the system if it is ok.
 

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for the 12v power supply to the brake controller tekonsha suggests 20amps for one or two axles, and 30amps for 3 or 4 axles. Is there a problem with using the 30 am breaker if I just tow two axle trailers. Would rather not under size the system if it is ok.

If you use a wire too small for a 30 a fuse the wire will melt before the fuse would blow, so you would have to make sure the wire is rated at 30A for the fuse to work correctly.
 
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