The link you gave was in reference to Mortar Barrages, whilst the OP is talking about onboard mortars.
Now before I begin on my tirade, let me say what an excellent job you guys did on this release. I am enjoying it very much. But I did say excellent, not perfect.
Steiner has already brought up the ridiculous accuracy of onboard mortars in relation to AT guns and open topped vehicles on the CC4 rerelease, on the Matrix forums. He has had zero satisfaction there and I strongly suspect my comments, which echo his, will have the same result.
Regularily, you get a one shot kill, even if the mortar doesn't have a LOS to the AT gun. But regardless, 5 shots is more than enough to knock it out. Totally ridiculous IMHO. Can't wait for one of the mods to come out with this toned down a lot.
None the less, a very good game.