90 secs is a lot. You basically need a gren escort for the entire duration of that time with the 222. 90 secs in a game is not much, but the window of effectiveness for a light vehicle is quite small especially against Brits which can get out their mediums faster than all other factions (10-11min centaur). Hence 90 secs is a decent amount of time eaten away from the window of effectiveness of a light vehicle when the fastest u can get 222 is around 5min. And when you play conservatively with 222 it means that your engaging and disengaging very soon to avoid the AEC meaning, you don't get much damage off on inf. You certainly cannot send the 222 alone to chase away a capping squad on the far side of the map because then the AEC can really dive for it.
And after that(which again is NOT hard to do) you have uncontested reign of superiority over brit.