A van is totally different to an HGV and carrying liquids comes under a different category to solid objects thatcham who do the crash testing state tanks should not be against bulkheads
You are saying a lot of stuff that makes no sense at all, and i don't know where to start.... but i'll have a go....
[1] There is no 'categories' , i belive you made that up.
[2] If you can show me anywhere that Thatcham state a 'tank' or any load for that matter should NOT be against a bulkhead then i'll eat my hat.
[3] Thatcham is a testing facility, NOT an authority on anything.
[4] Have you an idea what it costs to put your idea through to fruition and get it tested by Thatcham ?
And lastly but not least.... you appear to have no grasp of physics. I'll explain......(Bulkhead and tank scenario)......
If i was to open up the palm of my hand to you in a high five scenario and allowed you to punch it, there is a great chance you'll really hurt my hand, maybe smash my wrist etc... It won't be a pleasant experience for me, for sure.
If i was to replicate that, but you had to start with your clenched fist resting in my palm nothing would really happen, other than you may push me over if i held up.
And thats the difference regards a load being against a bulkhead.
You also previously suggested that an IBC (of say about 800 litres) that was 90 to 95% full may cause someone to wobble all around the road. This is pure nonsense. Its a real small space with a real small amount of liquid sloshing about.
Infact, if you had a half full diesel tank in your van that could potentially topple you over... well according to your logic.