If I load both longtable (ltxtable) and floatrow, then \sffamily is ignored and the table is typeset in roman. If I disable floatrow everything works as expected. floatrows \RawFloats command does ...
The floatrow package, which is useful for customizing the layout of floats, also allows to add footnotes as well as additional explanations (besides the caption) to tables. (The main commands are ...