Trim spaces in a T-SQL INSERT

I'm running an insert T-SQL statement to inter one record from one table to another. There is an nvarchar(100) field in the insert. Even if a wrap the nvarchar field in RTRIM or SUBSTRING, the insert result is that the target table field includes the padding of spaces beyond the value of the field. For example, if the value of the source field is "Answer", the value in the target field after the insert is "Answer                                                                                            ", i.e., the value + spaces. Any thoughts?
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It sounds like the target column is defined as a fixed width string rather than variable.
Verify the type of the target column is an nVARchar or other variable string.

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& This should tell you what that field's data type is. No points pl.
    , as type_name
    , c.max_length
    , c.collation_name
    , c.column_id
    , c.is_nullable
FROM sys.columns AS c
INNER JOIN sys.types AS t ON c.system_type_id = t.system_type_id

WHERE object_id = OBJECT_ID('dbo.YourTableName') --<< change to suit

AND = 'TheFieldName' --<< change to suit

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