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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Got my Coopers $800 out the door, without any credit for current tires. Don't know why you want the 305's, especially since (to me) the coopers suck on ice. I'd stick with the 275 and save a few hundred.
I put the cooper's on a couple of weeks ago about 2000 miles. I love them. I got them off of ebay from discount tire direct for 642 and paid tire kingdom 40 to mount ballance and new valve stem them. They are the stock size 275 60 20 I do wish they made a 275 65 20. Nitto used to make it for their terra grappler that would add an inch to the height. I would go with the coopers though. the 305's will wear faster use more fuel and give you more of a chance of rubbing during certain driving conditions.