I agree. The curb side slide carpet slides under the street side slide when retracted. I have never tried it in the wrong sequence so I don't know for sure than it will cause a problem, but don't want to find out.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof