It is not a rule - as in a legally binding rule but more of a rule of thumb. Also there is a range - 5 to 10%. My rule of thumb is to have a tow ball weight that will cause the back of the car to settle to about the same position as it would if two hefty blokes were sitting in the back seat - is somewhere about 1 1/2" to 2".
Also be aware of any train weight limitation - that is the total weight of vehicle, tow and load - on some vehicles this may lower the amount you can tow if the tow vehicle is also loaded up.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
Trailer braking rules were made to apply to all road-registered trailers quite some years ago. Owners of boat trailers especially kicked up a fuss and given an extended time to comply but now all trailers must comply or else. My mate got some special stainless disc brakes on his boat trailer with cable operated calipers so he is legal with his old boat. And a friend of my wife has her ancient heavy 3-horse float converted to break-away to make it legal.
A bit like the new rules for little kids in pre-seat-belt cars: there are no longer any exceptions.
The weight on the towball issue has been discussed many times on this an other forums. It is one of those rule of thumb things and I would not worry too much about applying it to tandem axle trailers. You don't want the trailer to be trying to lift the back wheels of the tow vehicle off the ground so you do want some weight on there, but for a 3500 kg van that would be 350 kg on the ball which is almost half the total load capacity of the defender, there is no way I would put that much weight on my towball.
The legality will be that whatever the lesser rating is will apply, if the manufacturer says 150 kg it will not matter that Hayman Reese say 250kg.
I realise the OPs LandRover has the stronger Salisbury rear diff, and also realise that there are many who succesfully tow 2-3 tons with Discos and RangeRovers, but what about later defenders with the light duty rear diff ? The larger tyres fitted to these vehicles compared to standard Discos etc would place a significantly greater strain on the diffs when towing similar weights. Have there been many reports of diff failures on these vehicles?
Wagoo.
I used to tow 3.5 tons or so a fair bit with my 90 and never had any issues. All 90's have the rover type rear diff. I never had any problems.
looking at the age of your rover, I would make sure the brakes are in good working order. All suspension bushes checked, including A frame ball joint.
change out the LR temp gauge and put in one that actually tells the truth. Make sure you have an EGT gauge, youll drive alot by this. If your Rad hasnt been rodded out in the last 70k do it.
Make sure you use good oil in at least the engine gearbox/t case and rear diff.... change at minimun of the schedule
Dont expect to go anywhere fast....it travelling out west in summer on ANY incline or ANY head wind expect to only maintain 95kmph to keep the vehcile in a good operating temp (coolant and EGT)
Serg
^best advice yet. Pat
X2.
JC
The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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