i know how you feel with the holiday thing...many years ago we left Brisbane headed for Canarvon Gorge and only made it to Toowoomba before the rear diff decided it's bearings had reached the end of their lifespan (the diff always had a bit of a whine about it for years). I tried getting the vehicle repaired in Toowoomba through a mechanic i knew there but he couldn't get the parts needed or get anyone help us out, so we ended up leaving the camper trailer at his workplace in town and drove back to Brisbane to have the vehicle repaired. I would have put money on the diff locking up on the run home with the noise it was making, but amazingly it made it back to Slacks Creek and i dropped the vehicle off at Diff Lapping who i'd called from Toowoomba. By 3.00 p.m that arvo they had the diff apart and gave me a quote on repairs, by 10.00 a.m the next morning we were on our way to Carnarvon Gorge once again, just a touch lighter in the old hip pocket...lol.
Hope you get the vehicle fixed soon without to much drama