Well just an update to my post. At the last minute we decided to use the Pacific crossing which is a few minutes to the east, still easy to get to from the Tsawassen ferry. The lanes were tight but doable if you were careful and the height was not an issue. After the booth, cars had to weave through an obstacle course to leave the customs area but the officer radio’d to her fellow officers who opened the “ long route “ ~200 yds for us to leave the customs area. I asked her if we could have used the Nexus lane and she said while it was allowable it would have been very challenging making the necessary turns to leave the area. I also asked if Peace arch was possible for a vehicle of our height and she said “ I would like to say yes but honestly I am not sure.