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As I recall, the R1P had only minor differences such as suspension tuning, and some upgraded componentry like the battery, alternator, cooling system etc.
The sway bars are only 1/8" different in dia. but it makes a nice difference. BTW, you said "front swaybar", does that mean you didn't do the rear one too? I did both and it was well worth it. As for the heavier frame, I think the limo, hearse, and armoured chassis got the heavier frames. They also recieved several strategically placed gussets too.
 

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The R1P is a "Livery" package meant for fleet sedan use. The V4U is the Coachbuilder delete chassis which is what limos are built on. The B9Q is the hearse package. Some cars are stretched that are NOT V4U cars but those are VERY unsafe and are NOT warrantied in any way if modified in that way.
 
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