mam is the maximum absolute mass.... so basically. as much ad the car is legally allowed to weigh before its classed as overweight


so, theoretically I will throw some figures in for you...

Say you have :-

A car weighing 1500kg unloaded that has a mam of 2000 kg

Then you can tow a trailer with a mam of 1500kg as your total will be 3.5 tonnes MAM and you MAM of the trailer does not exceed the unladen weight of the tow car.