Pretty much the same for me too. An astute opponent might work out that my GK's are colour coded to their transports and my SM are numbered the same as their rides, but either way if they want to know I'll generally tell them.
Yea pretty much the same here as far as unit/transport designation goes. With my Guard army my whole 20K's worth is numbered as per the way it's set out in IA1 - e.g.
III - 1st digit is Company number, 2nd is Squadron no, 3rd is Vehicle no.
There are variations such as using Roman Numerals, Insignias, Names, etc, but the embarked units have matched numbers etc.