Wheel Bearings for 80 series Cruiser

I have a 1992 80 series Land Cruiser with 120,000 km on the clock. We are leaving for the Kimberlies on the 17th. At 105,000 km I had the wheel bearings re-packed as per the Toyota service schedule, and since then have done the Simpson, including a wet and muddy trip back down the Birdsville Track including a number of shallow creek crossings, and a few other shorter "dry" bush trecks. Like everyone 3/4 of the driving however is on bitumen. My question is that the Toyota manual now recommends that the wheel bearings be done again and 120K, which on the 80 series is quite expensive. I have had mates not do bearings for anything between 100K to 200K without difficulty, but I obviously do not want to have problems in the Kimberlies. I would be interested in any comments, as it seems to me that the Toyota "recommendations" are a bit excessive. There is no rumbling or sign of anything wrong at present.