A good question.
A local answer.

Choose either a Hobart day or a Huon Valley drive for Sunday, and check road and attraction hours before departure.

Give Cradle Mountain its own weather-flexible time rather than treating it as a quick stop between valleys.

Pack layers and a waterproof outer layer rather than dressing for one city forecast. Mountain conditions can be much colder.

Choose Port Arthur if its history is the priority or Freycinet if you want landscapes and walking.

Keep the central Hobart days car-free if your hotel and planned sights are walkable, then collect the car for the regional leg.

Make the last day near Launceston rather than a long Freycinet diversion before a flight. Allow time for fuel, car return and unexpected slow roads.

Check the sleeping setup, permitted roads, excess, tyre cover and minimum hire duration before comparing vehicles. A 4WD badge does not automatically permit every track.

Confirm campervan site availability, road conditions and vehicle restrictions for your dates. Keep some slack for weather, particularly around national-park walks.

Choose two regional anchors beyond Hobart, then check the real driving hours and child-friendly stops. Trying to cover every named place can consume the week in the car.

Put real drive times and overnight bases on a map before adding activities. Six dispersed stops plus a west-coast railway or cruise will crowd a seven-day trip.

Confirm the exact vehicle class and luggage space, plus whether a city branch can guarantee your pickup and return times. Read recent branch-specific reviews.

If you must travel at night, check road alerts, rental pickup hours and fuel stops before departure. Drive to conditions and avoid trying to recover flight delays by speeding.