You don't really need 5 weapons on each guy, a gun and a few grenades is usually good, the more weight the slower your guys show up in the turn list. Try bazookas on Gallant and Keith and PPSh1941 on the others except your snipers, you can add a few grenades to each and/or a melee weapon, for items, the infinite ammo item works as long as you don't unequip it, use that for anyone with guns and some rockets for the bazooka guys, then fill the rest with healing items dragon scale, black crystal etc.