Folks don't have any problems getting the Vanco's for their trailers on this or any other trailering websites in the USA or in Europe where their used on trailers. Simply drop by your Continental/Vanco tire dealer and tell them what you want. My area Continental dealer says the Vanco's are one of his more popular tires for his customers trailers. No one has reported any issues with them on this or other trailering websites here or over there.
RV.net had the same problem with FastEagle and his same type load the question email from Michelin about using their XPS Ribs on trailers. Michelin says the LT E Ribs aren't to be used to replace a ST E tire.
However we have several emails from Michelin stating if the LT E at 3042 lbs capacity meets the trailer axle requirements then they are a good match and Michelin gives them their blessing.
The email from Michelin and the one from Vanco doesn't tell us how the question was worded or even what the question was however both got the standard liability issues answer that any tire maker will give if the right question is asked hence specifically worded question backed them into the liability corner.