Work it out where you can fund the lesser expensive, highest return mods (aero flaps, tabs?) with an initial investment and then get to pool all the excess fuel money into an aero-mod account. But make sure you include driver re-training to make the money come in super quick so you can try out some of the more expensive mods in a short time!
And start lobbying to see if trailer tails can be excluded from maximum length limitations, especially if they only activate at speed. That is low hanging fruit if the law can be modified.
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