Using the adapter will not be a problem. You will be limited to 30 amps total use.
However, if 50 amp is available at the pedestal I recommend using it. The 50 amp receptacles are generally in better shape than the 30 amp.
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.