If it were me and the run is not to far, I would install a 50 amp 2-pole receptacle. This way you are prepped if you ever upgrade to another coach. Adapters to your 30-amp cord are cheap and are needed in your arsenal when you travel. If you install a 30 amp receptacle, it is a single pole.
"If you think it could rattle, it will"
2006 National Tropical LX T350, CAT C7 350HP, MH3000
2014 F150, SMI Air Force One, Blue Ox Avail