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We have a 2003 3 litre GU manual. It too has towed a van around oz a few times and has 362000k. We are traveling around Outback Qld at the moment towing a Jayco camper and it does a great job. Still doesn't use oil or leak any and the only repair has been replacing its original clutch at 300k oh and I changed the belt tensioner before we left home.
Ours is stock, standard exhaust, no Dawes or catch cans, besides the factory snorkel it's as it left the factory.
I paid $5000 for ours. Bargains are out there , just keep looking