When a sight says it has 50 Amp service, do they usually have both the 50 amp outlet, and the 30 am outlet in the same post? My first trip out last weekend had 30 amp posts, and there were also 20 amp outlets in the post. I was told when I got my trailer, that I wouldn't need a 50 amp to 30 amp convertor. I did get a 15-30 converter that I use at home.
Well as Big said, there are 50 amp only places. But even if you reserve a 30 amp site, you may get there and they may have to move you. If the new site is 50 only, you'll be running a genny. The dogbone converter is just a few bucks.