Would it be the GSDI course?
As for driving it, you need to be fam'd on it before you arrive and this is a 3 day thing.
But aside from that, its easy to drive. Auto gearbox (you can override it and make manual changes but dont bother on the road). 6t is closest to a civvy truck out of the 3 variants (6,9 and 15t). But you need to do the SV Conversion course before you go on this course you are mentioning.