ML flat towing, coolers...
Firstly you do not need a oil cooler, as most modern transmissions are already set up, so long as you do not exceed the towing limits, to tow the amount rated in the case for the ML.
However dry towing, particularly long distances is a dumb way to go, and will for sure create problems.
Invest in a good quality car trailer, not only will the rig tow better, but you will put no strain on the ML at all.
However make sure, that the truck is tied down in such a way, that it cannot move back and forth at all. You could have problems with your wheel bearings otherwise.
Regards
Col Tigwell Downunder



