Thanks guys for your responses!
@twscoot should we do anything about the cooling system or upgrade the radiator! My hubby is worried for the next 6 hour trip on Tuesday!
MHO - if you want to be sure, get it checked out, let them know you are using it for towing, and want to make sure its all ok
Radiator, Water Pump, Hoses, Thermostat, Radiator Cap........
maybe fit an external Transmission cooler - never hurts
also - not sure if they ( Pajero) have one - but have a look on eBay - there is a guy who sells Temperature gauge and wiring for the Auto Transmissions
never hurts to be sure everything is A OK
if your Mech is honest and reliable, he should be able to help you and commend the right way to go.