I can picture the scene, a trailor with Widnes Vikings splattered all over it comes to Warrington to do a delivery, i'd be suprised if it arrived back at the depot in the same condition it left.
A Leeds Rhinos trailor having to nip over to Bradford to do a delivery, i doubt the natives would be cock a hoop about that.
The Hull and Hull KR ones will be interesting if they venture onto one anothers patch.