For "self-guided" weapons like the V2 and the V1, unlike guided weapons like the Fritz-X where the human in the loop make course corrections as needed, you need a precise launch location as well as the location of the target. Sure you can park a portable V1 launch rail in a field, but unless you have a pretty accurate launch location, you've just added to the inaccuracy of the missile. Likewise for the V2.
If you have some method of course correction, such as terrain matching for cruise missiles, this inaccuracy can be corrected for, however both the V1 and V2 have no such system.
my speculation was only regarding the V-1, had they used the alternative propulsion system investigated historically, and been able to dispense with fixed rail launch
meant use them over shorter distances, in addition to historical role, not that you could throw it in a truck, deliver to Italy and be able to launch against a target 100+ miles away.
meant they might use them as they did the K-5 rail guns to strike 15 - 20 miles away?