Recon units.

[serg3d]

Motociclers:
pro: fast, good spotting ability
con: weak weapon,
Infantry scout:
pro: size 0, good spotting ability
con: slow, fragile
Cavalry scout:
pro : fast, good spotting ability
con: fragile
Cavalry
pro: adequate weapon, fast , good spotting ability
con: big size
Infantry:
pro: good weapon, good spotting ability
con: very slow
Mech Infantry/mech scouts:
pro: fast
con: have to dismount for spotting

Armored cars and light tanks are fast and strong, but not a good recon - they have bad spotting and big szie. They are good for recon fire support though.
Especially good recon force combination is cavalry/cavalry scout/motociclers + mech infantry recon + armored cars/light tanks.
Cavalry/motociclers make a forward screen, as they fired at scout dismount and after that armored cars/tank give support fire. The drawback is such force is expensive and not esay to coordinate. Also it's not exactly recon, more like mobile forward detachment