I tow a 22ft 6 in Caravan which weighs right on 3 tonne with 210 litres water and 40litres fuel on board.(2 Jerry cans on caravan)
After monitoring over long trip found temp light did not come on till 118 deg which is almost too late so I installed small trans oil cooler in return line. I can now drive all day up hills and tow at reasonable speed and never exceed 100Deg C.
I think it is a cheap way of prolonging transmission life. This was fitted approx. 3 years ago and has worked well for me.
Richard
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