Humber bridge Board are a bunch of eejits.
We have a 33 foot RV and the first time we ventured in to gods own county in it, stopped to pay the toll, and was going to be charged full HGV cost (taxation class is HGV light goods)
When i informed them it was 7.5 tons ( i drive on Grand dad rights) it then changed to being charged as a 7.5 Ton Luton van.
So i think the plan is book as a Trike and risk it on the tunnel, i will keep you informed.