Wow, conflicting opinions.
I don't pull a toad but I do use the Nexus lane and for that the truck crossing is clearly the best. The coned Nexus lane at the Peace Arch is quite narrow with signs very close to the mirrors.
At the SR243 Pacific/Truck crossing at Blaine the Nexus lane involves a bit of a left turn as you enter the yellow security barriers and could be tricky if pulling.
Personally I think it would be great if they'd allow bigger RV's to use the truck lane on the right of the building.
2007 Fleetwood Southwind