Even a Stirling needs a heat sink. Since the heat rejection will presumably be at a lower delta-T the "radiator" would have to be even bigger.
Stirlings are awfully heavy/bulky for the power you get. They may be of value in stationary or even marine applications, but I doubt they would be worth the space/weight/cost on a land vehicle that rarely operates at over 50% of rated power.
Again, a technology that has not been widely used for good reason.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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