To even out the axle width, I just installed wheel spacers on the rear of mine. That way the Backspace on all of my wheels are the same, not making any difference which corner the are installed on. To each his own though. Some people will say that spacers are dangerous, others will tell you they have been running them for years w/o issue. 2.5" spacers put the rear wheel track a bit wider than the front. The look I wanted. Turn radius was decreased a bit, but these things ain't made for cornering anyway.
When I get ready for a new set of wheels, they will get a minimal backspace too. To hang the tires out a bit farther.
W/o the rear spacers;
With spacers;

With the flares installed;
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Slot Cars, 1:24 Scale, 100MPH@100,000RPM, fastest things on wheels!