fair play matt but i have berlingo and it isfully ply lined
i guess you have a tank in the van ?? ? yes, as otherwise why would you need a DI
just ratchet strap it too the tank
OR in the berlingo, look under the van, you will see a hole near the rear and 1 about 2 ft down, going through the chassis rail, drill though that and bold a tie down eye to it, job done