3)If that 'flak emplacemnet' means the 88 mm.This is the biggest factor as it would give this a lategame AT option.iF 88 MM cost just mp like pak 43 it would be very popular as OKW have fuel scarcity and camping around truck is ideally suited for an emplacemnt like that..think british 17 pounder
Going by the picture, it's a single 2cm Flak 38.