Just add a long ranger tank, which adds 80 litres. A current LC 300 has 110 litres, 200 138 litres. The Patrol has 140 so add 80 and it would be 220 litres. If towing at 25 litres / 100km, 210 litres (10 litre sneeze factor) would get you
These preceding figures show range of a Y62 at 25 litres/100km compared to a 200 series diesel and a D4 LR all towing. Some tests also portray the Y62 as using even less than a 200 series towing a 3 tonne van. But the driver is important and to get decent fuel economy on a Y62 would require slowing down on hill climbs IMO, hence not so relaxing and you'd have to think about it. But it's took of one way to stay awake!
Type Used To Use Range Y62 25 210 840 LC200 18 128 711 D4 15 80 533 
10 litre for sneeze factor and with a diesel, you cannot run it empty due to likely bottom tank contaminants, you can with the petrol.
There is also a Long Ranger tank that will remove the spare tyre, same for the D4 etc, in the Y62 it adds an extra 152 litres to the 140.
As to weights: here is a list of the weights. And advantage with LR is no need to add air springs to the rear axle. And air springs add some weight. Most towing Landcruisers have GVM upgrades, which ruin their around town ride (they must IMO).
Some raw numbers showing the payloads of vehicles able to tow:
Incidentally the Tank is quite good off road, luxo inside, but is not suitable for towing as its a hybrid and it depends on its battery power for adequate performance, while the battery power is not there while distance towing.a
Type Vehicle Gross Braked Kerb Gross Calc'd 
Comb Tow Weight Vehicle Pay 
Mass Limit 
Mass load 
kg kg kg kg kg 4 Dr Troopy Toyota LC79 GXL 4-Door V8 6800 3500 2175 3300 1125 4 Dr Troopy Toyota LC76 GXL 4-Door 4 6560 3500 2265 3060 795 
aUte Toyota Hilux SR5 UTE 5850 3500 2093 3050 957 aUte Ford Ranger Sport V6 UTE 6400 3500 2400 3350 950 
SUV INEOS Grenadier Petrol 7000 3500 2665 3550 885 SUV INEOS Grenadier Diesel 7000 3500 2740 3550 810 SUV GWM Tank 500 6705 3000 2605 3395 790 SUV Toyota LC300 GX 6750 3500 2495 3280 785 SUV Defender X-Dynamic SE 7 6775 3500 2506 3280 774 SUV Defender X-Dynamic SE 5 6700 3500 2436 3200 764 SUV Toyota LC 200 GX 2021 6850 3500 2640 3350 710 SUV Toyota LC 300 GXL 6750 3500 2580 3280 700 SUV Ford Everest Sport V6 6250 3500 2455 3150 695 SUV Nissan Patrol Ti 7000 3500 2812 3500 688 SUV Ford Everest Platinum V6 6250 3500 2499 3150 651 SUV Toyota LC 300 Sahara 6750 3500 2630 3280 650 SUV Nissan Patrol Ti-L 7000 3500 2861 3500 639 SUV Prado GXL 6600 3500 2535 3150 615 SUV Toyota LC 200 Sahara 2019 6850 3500 2740 3350 610 SUV Prado 250 VX 6600 3500 2570 3180 610 SUV Prado Base GX 6600 3500 2495 3100 605 SUV Prado Kakadu 6600 3500 2595 3200 605 SUV Lexus GX 550 6650 3500 2515 3110 595 SUV Prado Altitude 6600 3500 2520 3100 580 
The Prado has been disabled IMO by putting in metal doors and thereby increasing its weight a lot, otherwise it would have competed with the LC 300 quite well IMO, although its engine and ad-blue are severe negatives IMO. Nonetheless it benefits from "serviceability" in remote areas.
Also Land Rover never have lost their patent on pushing the unlifted tyre downwards in off road mode via air pressure from the parallel tyre. They are linked front to back in high range. Meanwhile the Y62 links the front to the rear I think all the time with hydraulics, a system I do not fully understand. But IMO they are very good off road compared to other vehicles in standard form (excepting LR, Ineos and GR LC 300 probably) except for the Y62's bulk. The Y63 will have air suspension and a turbo V6, I imagine it will be more fuel efficient except if one uses its power.
Now if you add 2 adults that's 160kg, plus two children that's 90kg, = 250kg. 639 => 389. The fuel tank would weigh 40kg, so 349 left, not including the 80 litres of fuel = 60kg =>289 kg. Take a bull bar off that @ 45kg =>244kg.
Now you if you added a 2.5 tonne van to that, will that would add 250 kg, which means your illegal. Not including the weight of the tow bar. Plus some clothing and drinks in the Y62. Add levelling air springs for safety, and you add more weight.
Add a fridge @ 40kg + battery at 30 kg + wires plus a rear view camera all up 15 kg its another 85 kg and then some light weight draw with some tools in them and its another 50kg. ... you've lost your insurance and you're breaking the law.
Yet - it's all quite close to being legal. Running with the 2nd tank empty, you'd have 244 kg. That's hopefully a 2.4 tonne van. Annoyingly though, it would be safer if it was 280 kg - weight on the rear for a van is a good thing. Put it down the back of the van and things are much less safe ... so the tow ball weight issue is fraught with safety issues where a rear weight biased trailer is more dangerous but legal while a safer weight bias is illegal.
I wonder if makers don't do this deliberately, to make it difficult to use the vehicle for what they market them for - long country driving and towing along with some things and people inside the vehicle. Maybe its lawyers, actuaries and warranty number crunchers who have sat down and said lets make it difficult for an Australian tow vehicle to tow a 3.5 tonne caravan with a four people in it legally. And the proof is in the pudding ...

