You can run the 15.5 width tires. No problem. May rub under heavy articulation.
Not sure what year truck you have or if it is still under warranty but I know a bunch of guys around here have been given a hard time by the dealers on warranty when running tires larger than the stock 37"'s. I'm running the 16.5" version of the same PJ's your looking at and they are awesome. Have a second set of rims with GSA's for those trips to the dealer.
As for ebay and 17" 2pc. Good luck. First they rarely come up and when they do it's usually a set of 4 with asking prices in the 2K range. Problem is it's the killer wheel setup straight from the factory and few folks if any replace them for aftermarket.
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