Head gasket issue isn't a "IF", it's a "when" for sure. My wife's same thing, driver's rear is where it starts. It's due to the Y pipe for the exahust, it goes behind the engine, and connects the two mannifolds right at that rear corner of the head/engine block before going down and to the back of the vehicle.
OTHERWISE, they're great rigs. My wife loved hers. There's a major following for those things, and they go for a lot, $2500 might not be a bad price. People sorta address the issue with headers, and running pipe down under the cab, and reconnecting to single pipe due to the O2 sensor, but it's expensive.
On that note. My wife's finally putting hers up for sale. I told her no more. Getting your hands in that engine bay to work is impossible. It's ridiculously cramped.