I have the magnitude 2020 with the 550 chassis and the def is on the left. My d e f was hard to fill, until I found out that if you Pullin to a rest stop for example make sure your DEF fill side is on the high side of your rig so your rig leans a little bit to the right. With a funnel filled just fine in 2 minutes . If your rig is level the def is hard to fill, took me over 45 minutes for just 2.5 gallons as it burped back out all the time.
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