When I used to go to long trip MCA events I bought inexpensive flexible plastic mud flaps and contoured them to each wheel well.
I used small binder clips to fasten them to the lip on each wheel well, about 5-6 per side. Easy on easy off and never lost one in all those trips.
To keep bugs from rad and front end of the car I got a piece of fibre glass screening that covered the entire grill opening and using the same binder clips fastened it to the rad support at the top and the lip on the lower valance.
Both these tricks sure saved a lot of clean up at the destination.
Good work ain't cheap, Cheap work ain't good! Simple Man