I've seen numbers of times the 2 Gulstream G4s based where I work taxxing with one thrust reverser deployed; I have noticed as well that it was always the starboard one, although this might just be a coincidence. I don't remember having noticed this on any other bizzjet.
Is it a procedure specific to the Gulfstreams or have you seen it on other types? Would you have any explanation for this?
Thanks to all of you answering. I look forward to finding out.