Avoid gravel roads, and other road debris while driving at freeway speeds, and the answer is probably nothing required. I've towed my Wrangler over 20,000 miles without any problems, except the road grime that accumulates on the towed vehicle. The Navion has front and rear mud flaps behind the wheels, and that's it.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)
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