State of Decay cannot relocate homebase to trucking warehouse
Solution 1:
First of all, what game mode are you playing? Story or Breakdown?
For the story, you must have progressed far enough to be able to move bases. If you are playing Breakdown, I suggest you make sure you have cleared the area before trying to relocate. To many zeds in the area can prevent certain actions.
Also, make sure you have enough Influence to order a move.