with medtruck units and a 50 range AT gun.
and with cammo, and with retreat ability, and with garrison ability, mines, faust, etc
by the way, most players at the moment with how strong fast mech truck is are now going mech anyways, at least not that i've seen.
it's a part of adopting in the game, ur enemy wants to rush light vehicle? you counter it with ur better light vehicle, ur enemy wants to skip light vehicles? u can adopt accordingly. not every game u have to skip or build any truck, it depends on how your opponent techs. maybe if every day ur opponent wants to rush light vehicle then every day u also have to rush ur own right?
that's how Ost has always been, Ost has AT gun with 60 range and OKW 50 range? instead OKW's AT has camo which means the enemy can't get away with the first shot. OKW's at gun is squishy? when it trouble it can retreat unlike any other in the game. and it can also garrison, u can be too aggressive with it and retreat when in trouble
They thing is, it's gonna be a different playstyle.