What HiAce towing capacity really leaves you once the camper is built

The HiAce towing capacity printed in a spec sheet assumes an empty van. A finished camper fitout adds 400 to 700kg, and Commercial Motor Group puts a typical HiAce’s total payload at about 1,000 to 1,200kg. What’s left decides your trailer.

How much towing capacity does a HiAce camper actually leave?

Less than the towing rating implies, because the weight of the camper build and the load pressing down on the towball come out of the same payload allowance. The rating tells you what the van is engineered to pull. Your payload tells you whether there is anything left to pull it with.

Commercial Motor Group’s breakdown of HiAce conversions shows where a fitout’s weight goes:

• Bed frame and mattress, 50 to 120kg.
• Full water tank, 40 to 100kg.
• Drawer system, 40 to 90kg.
• Kitchen unit, 30 to 80kg.
• Dual battery setup, 30 to 60kg.
• Fridge, 20 to 40kg.

None of that includes people, clothes, food, tools, recovery gear or the beers in the fridge. Those go on top.

A heavy build at 700kg takes well over half the payload of a HiAce rated at 1,200kg, while a light 400kg conversion leaves you roughly twice as much to play with, according to the same Commercial Motor Group figures. That gap is usually the difference between towing a small caravan and towing a box trailer.

What do GVM, GCM and towball download actually mean?

They are the limits that decide whether a loaded HiAce and trailer are legal, and the advertised towing figure on its own tells you very little about them. REDARC sets out how each one is measured.

Kerb weight is the van with a full tank of fuel and nothing else, before accessories, luggage or passengers, so it is the last time your HiAce will ever be that light.

Gross Vehicle Mass, or GVM, is the most the van may weigh once accessories, luggage and passengers are loaded. REDARC notes that when you are towing, GVM also has to cover the towball weight.

Gross Combination Mass, or GCM, is the figure you would record by driving the fully loaded van and the fully loaded trailer onto a weighbridge together. It is the limit most camper owners breach first, because a heavy van plus a modest trailer can exceed it while both individual weights still look fine.

Aggregate Trailer Mass is the loaded trailer’s total weight before it is hitched. Gross Trailer Mass is what its axles carry once it is coupled up, with the towball taking the remainder.

That remainder is towball download, and REDARC says it should generally sit between 8 and 12 per cent of gross trailer mass for stable towing. On a 1,500kg trailer, that is 120 to 180kg pressing on the back of the van. The trailer’s nose weight is carried by your HiAce, not by the trailer, so it reduces what you can legally load into the camper.

Do petrol, diesel and 4WD HiAce variants tow the same?

Not necessarily, which is why the only towing figure worth planning around is the one published for your exact variant. Toyota Australia’s HiAce specification sheet, dated 28 August 2025, lists weights and towing ratings variant by variant rather than as a single HiAce number.

Even then, the brochure is the second-best source. Commercial Motor Group recommends reading the exact GVM and payload off the individual van’s compliance plate, because those numbers move with model, year and whatever has already been done to the vehicle.

Modifications move them further. Bus 4×4 rates its all-wheel-drive HiAce Commuter conversion at 4,300kg GVM, which it says adds 590kg of payload over standard, along with 180mm of extra ride height. An upgrade like that changes the plate, so re-read it afterwards instead of assuming the old figures still apply.

If you have not bought the van yet, drivetrain choice affects more than towing numbers, and our comparison of choosing a HiAce automatic or manual for touring covers how each one behaves under load.

How do you check your setup at a weighbridge?

Weigh the van the way you actually travel, loaded, fuelled and with everyone aboard, then weigh it again coupled to the trailer. Public weighbridges are cheap, and the methods REDARC describes take about half an hour.

1. Weigh the camper fully loaded and compare the total with the GVM on your compliance plate.
2. Weigh the front and rear axles separately so you can see where the fitout has put the load.
3. Unhitch on level ground and rest the drawbar on a scale to read the towball weight.
4. Drive van and trailer onto the weighbridge coupled together and compare that total with your GCM.
5. If any single figure is over, take something out rather than hoping it is close enough.

Axle balance matters as much as the total. Commercial Motor Group recommends a HiAce camper carry 50 to 60 per cent of its weight on the front axle and 40 to 50 per cent on the rear, which is hard to achieve once a rear kitchen, water tank and towball load all sit behind the back wheels.

Leave yourself room, too. REDARC suggests keeping a 10 to 20 per cent buffer between the trailer’s weight and the van’s maximum towing capacity, because trailers gain weight over a trip and tow ratings do not.

Should you tow anything behind a HiAce camper?

Yes, provided the trailer is light and the fitout is not. Best for a HiAce camper with a modest build towing a box trailer, a dinghy or a pair of bikes, rather than one with a full kitchen, water tank and dual batteries trying to drag a caravan.

Work it in this order. Read the compliance plate, weigh the loaded van, subtract that from GCM, then subtract the towball load from what remains of your payload. The number you are left with is your real towing budget, and it is usually smaller than the rating that sold you the van.