G'Day Basserman,
I've towed my SR17 from Sydney to Brisbane to Mission Beach (NQ) and back to Brissy, having no problems at all with the trusty V6 Commodore (2004). Launched and retreived in all sorts of ramps, some in some pretty low tides too with no problems either. I'd recomend the tranny cooler too.
Cheers,
Tony # 8)