depends on the tons your hauling this is me up to 42.5 tons 1 trailer start off with deep reduction in high 1st low split, 2nd gear low split, 3rd low, split 4th, 5th low split then flick it into high range up to 75 tons eg 2 trailers start off deep reduction in high range 1st low split, 2nd low split, 3rd low split , 3rd high and continue up splitting the gears up to 115 tons tripple road train start off with deep reduction in high range 1st low split ,2nd low split, 2nd high split then split all gears onward if I am am starting on a steep hill with big tonnage eg over 75 tons I might start off in deep reduction but you gotta be real careful as things can break real easy I have broken carrier bearing bolts pretty easy to smoke the drive tyres while waiting for the back trailer brakes to lift off all this depends on the road and the load dunno if this answers your question will be interesting see what other people say Paul