`If you intend to work with a Category N vehicle to tow a truck exceeding the restrict over, you then must pass a functional Group B+E test. If you want to push a car with a MAM exceeding 3.5 tonnes, such as a motorhome, you should move a Category C or C1 test.Your drivers' guide will towbar likely provide home elevators the utmost permissible truck mass which may be towed by your car or truck,...