I routinely stay at a location that has 50 and 20 amp only at the pedestal and with my prior Class C I used a "dog bone" adapter without issue. Although they say 50 amp, when you make the reservations ask if they have 30 amp service. I have seen campgrounds advertise only 50 amp so they can get the "big rig" business.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054