What is the biggest sized van that can be taken onto channel tunnel train?

Standard Vans: vans up to 2.05 m high, between 3.1–8m long (for short-wheel base vans - under 7 m long the width is restricted to a maximum of 1.99).

High vans : more than 2.05 m - max weight 5 tonnes with max width and length remaining the same as for high and medium vans.. (However on Eurotunnel vehicles should not to exceed 55.6 tonnes with or without trailers.)