Lithgow to Albany

I'm heading around Aus with my wife - but she will be at a conference in Sydney for a week, which is why I'll be doing the lithgow-broken hill-port augusta-albany section on my own in 7 days. I'm planning on doing around 700 km per day with a day rest near Fowler's Bay or the like.

Having never done the nullarbor trip, is this realistic on my own? It seems realistic based on the other trips I've done, but often nuances of a route dictate a different approach. I'd appreciate someone giving those figures a sanity check.

I'll be in a standard cruiser with a trailer and will be tenting/roofing depending on location. End of May is the general timeframe.

thanks,

Mark