Two numbers, two different jobs
Seats are how many people can travel legally. Berths are how many can sleep. They are rarely the same, and a van that seats five may only sleep three.
That gap is not a design flaw — it is what lets a small vehicle carry a group by day and sleep fewer of them by night. But it has to be planned for, not discovered at bedtime.
Where per-person cost actually falls
A two-berth for two people is efficient. A five-berth for two people is not: you pay for capacity you do not use, and you drive a larger vehicle for no benefit.
The per-person cost drops when the berths are full. That is the only version of the calculation that holds across the range, and it means group size should be settled before the vehicle is chosen.
- Two people, two berths: the efficient default
- Three people, three berths: still efficient, less choice
- Five people, three berths: a tent, or a different van
- Two people, five berths: paying for space, not saving
The berth count is the number to compare rather than the seat count, and the campervan hire in Australia fleet pages list both for every model.
Rooftop tents change the character of the trip
A rooftop tent adds sleeping capacity without adding interior space. In good weather that is a bargain. In rain, or when you arrive somewhere late and tired, it is a different experience from a bed inside the van.
That is not a reason to avoid them. It is a reason to know which one you are booking, because the two are not interchangeable in bad conditions.
What to settle before comparing prices
Settle the number of people sleeping, not the number travelling. Then find the smallest vehicle that covers it comfortably. Comparing a five-berth against a two-berth for a couple is not a price comparison — it is a comparison of two different trips.
Once the size is fixed, the city and the direction become the variables worth testing.
Pricing that size in two cities on the same dates is then the only comparison worth running, which is what the cheap campervan hire search does.
Questions this raises
Can I hire a van with more berths than I need?
Usually yes, and it is sometimes the only option on a given date. It costs more per person and gives you space you did not need, which is a fair trade only if you want the space.
Do child seats affect capacity?
They can, since a seat occupied by a child seat is not available to an adult. Check the fit for your group rather than assuming the seat count applies unchanged.