I feel the 81mm-armed V150 is pretty much as artillery-ish as the Project needs to get. It can serve as a expedient APC/cargo vehicle, and it uses tires and spares common to other Project vehicles.
If you use an M102 howitzer, and are running around with a single gun, you'll need 6 to 8 people for crew; so that's one vehicle (might be a V150). If you want to take a lot of different kinds of ammunition, and a sufficient amount of ammunition to be useful, there'll be at least one vehicle hauling ammo. Projectiles weigh 18 to 20 kg each; powder charges are 7 kg; let's say 25 kg per round. 200 rounds is thus 5 tons: so your gun needs a 5 or 10 ton truck. If you're operating halfway across the country from your ammo supply point, you'll probably bring several trucks of ammo. You might also need some security around your gun when it's firing ... in case someone sneaks up on foot behind you. So another team of "infantry" comes along, with some vehicle. And, do you stash caches of 105mm ammo all over the United States? Which ... could have been caches of stuff for re-building the country, not blowing it up.
A few howitzers aren't much use across a continent; a lot of howitzers makes a very odd Morrow Project. I think some MARS mortar teams, TOW teams and so forth, plus the MARS-One, should be sufficient for most purposes. Of course, it's your Project -- run your game as you see fit, and to entertain yourself and your players!
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