Why small bolt pattern?

Think: Trucks. The old Jeep and truck rims still sought a 5-lug pattern but they spread the studs out even further. Why? Because trucks and jeeps see higher loads. Your GVWR isn't increasing dramatically, but you are side-loading the wheels more, and you're more likely to push the load rating of the wheels and tires to the max.

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The 5 on 4.5" was clearly strong enough for trucks! Proof? It was used into the 80's! (And not just by Dodge...Fords also used it on vans & RWD trucks, though I think 4x4's used a larger circle.)

For Jeeps (and 4x4's in general): one reason they tended to use larger bolt circles is simple--the front axle needs room to put a locking hub!

Also note: some trucks used LH thread wheel lugs until at least the late 1990's!