I'm not exactly sure why but I vote for the rubber ones!

As for the squeaking I have never had that problem on any truck. I think some are "prone" to squeak because of several reasons. Rubber is somehow exposed to weather conditins ect ect.....and it seems some models just seem to squeak.....like the bushings in my 58 Impala and even more recent I've noticed my friends and other Blazer's seem to have that squeaky problem up front!
I would say it depends on the quality of the product.
Oh yeah, I use to squirt some silicone on the 58 bushings and they would be quite until it rained again! I think they get OLD and DRY out.


1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
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1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile