I had risers installed about a year after I received the camper and the first thing I noticed was that in rainy weather mud got all over the back side. Also had a lot of pebbles kicking out. Decided it was time for some mud flaps. Picked up a truck mud flap at the NAPA Store and also 6 Stainless steel 1/4X28 1" Bolts, stainless Nuts, Stainless Fender Washers and Stainless Lock Washers. Did a lot of playing around with a cardboard template before I came up the size 9 1/2" Wide by 12 1/2" Long with 11 1/4" Hanging down. I did have to notch the passenger side due to the rail for the screen house. Drilled the 1/4" holes at 2", 4 1/2", and 7" on the fenders.
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