derh20.......on the DP's like mine, they come with both and I think a lot of the debris is picked up by the ones behind the duals. Since the height won't change because they're mounted so close to the pivot point of the rear end, mount them so they're only a couple of inches off of the ground. You also want to mount them as close to the dual as possible.
Finally, use the hard plastic flaps so they don't sail. Truck stops or large truck supply stores have the best selection and price.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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