I have the Kangoo, I carry a 400L tank no probs. You just need to remember the weight of the equipment, anything carried on the roof + people travelling in it.
Yup, it's the 865D. The v5 says 1885kg Gross. It's a 2001 model I bought it off a company that sells welding supplies they always order the vans that can carry close to a ton.I'd post photo's but I can't work out how to do it.It's been a good van - struggles up hill with a full tank though.