Here's my opinion from actually playing the mod, no theory crafting here:
The USF mortar is subpar at best at lethal fire support. its main perks are F R E E smoke and its amazing pack up speed. And it's vet 1 phosphorus rounds are amazing but: good luck getting and keeping vet 1 however because It's extremely easy to decrew; I could swear the crew are wearing bullet magnets. One LMG gren/ pgrens can gun it down nigh instantly, though again it packs up pretty fast...still meh
In addition to that, the range is pretty low, further compounding the issue. The pack howie is much much better at pure damage, while having likely 3x the range and the 6 man crew which enables it to survive in its natural habitat.
Anyway, it is not a replacement for the pack howie, and I would say the MHT is much better Lethal indirect than the M2. However, the smoke spam capability of this mortar is not to be underestimated either.
