Being from the Wagga area I can only advise on Day 1 of your planned trip. Not really familiar with the Singleton - Lostock area but have traveled extensively over the other areas. Of the two routes you have suggested, I would personally Go via Temora and West Wyalong (although you don't actually need to go into West W as the Temora road hits the Newell Hwy the Forbes side of town). This route is flatter and has less hills and bends as apposed to going through Young and Cowra. Roughest roads of those two routes that I know of would be the Olympic Hwy Between Henty and Wagga. A third option you should consider is going up the Hume until Seymour and then turning onto the Goulburn Valley Hwy. This is dual carriage way all the way until nearly Shepparton. Follow it and cross over the Murray at Tocumwal and then it's the Newell Hwy and mostly 110km/h all the way up to Parkes
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