If a tank has been strapped then the van hasnt been modified has it - by definiton.
Its carrying a load
Of course more detail would be found in the small print of a policy but if they are asking me "does the van have any modifications" and my tank is strapped to the factory lashing points - then its a clear no.
See email above
Thye seem to agree with me - its isnt a modification....
I would suggest that line they have put about a strapped tank would be open to debate in a court. When you take out the policy you are asked about modifications, which its clearly not.
Are they suggesting you need to tell them that you will be carrying a load, any load which is what vans are designed to do ? i would say thats b******s. you are carrying a strapped load it makes no difference if its water, bricks, bikes or whatever.