Or another way to explain it...................
i ask you to give me a crack in the kipper, and you do. It'll hurt me, and may be, probably will knock me over.
Try do the same thing with your fist resting firmly on my cheek from the start.................
I'm sure your first crack will have a G force of whatever newtons law tells you, see if you can replicate it in the second scenario............
You choose not to understand. I don't care about a comparison of a load flying into a bulkhead versus strapped against the bulkhead. I care about the comparison between a load strapped to the bulkhead, which in your opinion is safe, and a system that has been shown to be safe by testing and that won't allow the load to go anywhere near the bulkhead.
Vin
Morning Vin

, i'm not boldly stating any tank just strapped to a bulkhead is safe. I'm saying in general, best practice is to secure to bulkhead for carrying loads. I'm also saying the current "best" fitted system idea is.......bolted through the floor, and its not really the best or safest way to secure a tank. They all follow each other and just do it, but its the best on offer out there at the moment. Actually, there is a guy , i've seen his site mentioned on here before, he makes bespoke fitted tanks that appear to be integrated into the van floor. Thats the best idea i've seen so far, but i don't think his are crash tested.
I'll ask again, has anyone contacted any van manufacturers to see if the floor strength has been compromised by this drilling, bolting and fitting ?