French to English Bus/Financial Transport / Transportation / Shipping Job titles/qualifications (Belgian text)

PLEASE NOTE, French (Belgium) to EN (Ireland and UK). I think this usage is quite specific to Belgium -- nothing much on the internet to go on.

"[...] les profils plus qualifiés (caristes RT, HT, FT), [...]"

cariste = forklift operator

I can't supply any more context due to confidentiality, apart from the fact that my text relates to temporary work (travail intérimaire).

I am asking questions for RT, HT and FT separately. I don't know if the abbreviations refer to job titles or the qualifications required, or possibly even something else (maybe even part-time and full-time?).