Transit vans what does 280 mean

[Nebby]

Looking to purchase a Transit van but what does the 260,280,300 etc badging stand for, I know the 75,85,100 etc is the power of the van but not sure about the other.
Thanks

[forks]

Its all to do with weight- 2.8t 3.0t etc

[Nebby]

Thanks, strange though why have such small gaps from one weight to the next seems a bit odd.I would of thought it would of been more like 2.5t 3.0t etc.

Thanks anyway.