Many years ago , I toured around Eastern Australia by bike, well not exactly, What I did was when I had spent enough time in a certain town, I would wake up at the Backpackers Hostel , then Ride out of town until I got tired, less than 10 miles, then when too tired I laid the bike down and stuck out my thumb to Hitch Hike. It moderately worked, most of the time I would get board of cars/ute's passing by not picking me up so I would ride some more , then repeat trying to Hitch Hike.
I tended to stay at a hostel for weeks at a time to really get to know the town, I even stayed a month in Bright , Victoria . ( Lots of Hang Gliding and Paragliding to see and Microlights to go up in ).
And a 3 or more week stay at Canberra Backpackers Hostel , because there were so many bike paths there in Canberra to ride . Canberra is a great town to ride bike paths, just thinking about it makes me want to go back for a few weeks.
And I did the Same ... Ride-Hitch Hike-Ride-Hitch Hike routine up the Coast from Sydney up to Cairns. Yep a Walkabout with Two Wheels.
I had a small handlebar bag, and a rear rack with a very large duffel bag draped over it to resemble panniers.
Most all of the trip I really Wished I had a BOB trailer, you would think that it would take up room but there is always room for it at the Hostel under/next to your bed ,
and some people think they can not take a trailer off road very well, However , the BOB Trailer is perfect for Off Road, ( Get the Ibex model ), and search articles and youtube videos on how people who do trail maintenance use the BOB trailer to take heavy tools to do the work on the trails.
http://www.outdoorgearlab.com/Bike-Carg ... -Ibex-Plus
If you do go with a rear hub motor, you will have to buy the ( BOB Nuts ) instead of the through axle quick release, you might have to get the " BOB Nuts " re-threaded if you go with a larger hub motor, they might work with the smaller rear hub motors though , more research on your part for that.
However, You say you will be going up and down some good size hills, Have you looked into Mid-Drives ?
And yes there is a front rack that bolts to a front suspension fork, I forgot what the name and Mfg of it is right now, But , it is a little over $ 100 plus the cost of front Panniers, with those you will be up to close to $ 200 , so you are better off
getting and putting most everything on a BOB Trailer, you can then leave it at your campsite / hostel, and ride around town/ trails without all the heavy items necessary for camping/living off a bike.