X2 by Boss Wagon. I have towed many miles since buying our used 2004 Designer 5er, which had several cracks in both wheel skirts when we got it. None have enlarged, and no new ones have appeared. If you can live with the cracks you have, you could save $$ by bypassing a new one, which will likely eventually crack as well. JMHO
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.