I am hoping that you can help me with this one. Well, I need to create a program for delivering modular units to another state. It sounds easy at first, input tasks/activities, wbs, then duration, set the links/relationships and use the right calendar. That is the usual of of doing it. But the problem comes when the client told me that it is a 7-day workweek for the loading and transportation itself but we can't unload on a Sunday. 

Say,

Unit A will be ready by Wednesday and it will loaded into a truck and is expected to be unloaded in the project site by Friday. Unit B, ready by Thursday, unloaded on Saturday. For unit C, following the logic for Unit A and B, it will be unloaded on Sunday, which is not ok for the client. 

I can manually put a lag between the delivery of B and C, but I don't want to. I have 400++ of units to deliver. And if the production is delayed, I will manually adjust all the succeeding delivery again. Can somebody help me with this please?

if unloading day = sunday then,

truck arrival on site = truck arrival on site + 1

I need the unloading dates to be able to know when to call the Trucking company because of lead times.

Thanks in advance,

Gep