Seriously though, these weight limits can be misleading - Citroens for example give a payload of something like 1200kg but they forget to mention that you need to allow for a full tank of fuel, a driver and passenger/s. My Toyota I believe, allows for a full tank of fuel before anything else is added.
Andy, I would think with two passengers and a full fuel load you would be very close to the limit.
Tank with water and boarding - about 700kg?
Two reels full of water 40kg
Extra battery 10kg
Ladders 5kg
Vac 30kg
poles 10kg
full tank of fuel 70kg
Genny 85kg
Bits and bobs 15kg
Thats about 965 kg before anyone climbs aboard