The info that you really need to know is clearly marked on the steering neck of U.S. models. The various manuals will only make you crazy.
"Basic weight" is a riderless bike with a tank of fuel. Handy to know when the bike is on top of you but has little to do with knowing the limitations of the bike.
The Gross Vehicle Weight Rating (GVWR) for the total of bike and rider is 625 lbs. Subtract the claimed wet weight of the bike from this and that leaves up to around 350 lbs. for rider + passenger or rider + cargo.
"GVWR, front" and "GVWR, rear" includes the weight of the bike and cargo, giving the Max. axle weight per axle with properly inflated stock tires, brakes and suspension. 220 lbs. in the front, 440 in the rear. This deals primarily with how the weight should be distributed if you're pushing the max limit. It also tells you not to load the bike to 125/500, cuz bad stuff will happen quickly. Hauling Grandma's piano on you Cyclerack: Bad plan.
Note that if you total this up it adds up 660 lbs., which is more than the max total weight rating. It's meant to indicate how much each tire, axle, brake and suspension on either axle can handle in terms of weight, but the max. gross weight of 625 still must be respected if you're picky and expect the swingarm not to bend and the bike to actually stop when you hit the brakes. Yeah, right..
The different tire pressures are for different combined weights. Max load is only valid at higher tire pressures. You can run 18 front and rear up to a cargo weight of up to 176 lbs. Beyond that you need to increase pressure up to as much as 22/25 at max weight.
The bike was meant to be a packhorse, not a motocrosser. It's shocked stiffly to prevent bottoming at max load within the limited amount of available suspension travel. You can lighten it up a bit by moving the preload clip on the rear shock, but it doesn't lighten up by much.
The Cali ("C" model) emissions canister weighs a pound. So in order to satisfy the legal department they called it 2 pounds and adjusted the weight rating by -2 lbs. to compensate. Purely useless info.
Minimum OFFROAD tire pressure is a judgement call as to how many rims you want to ding. You can prolly go as low as 10 in soft stuff on stock tires with a light rider. Go way slower or increase pressure for rocks or a heavier rider. My 110 pound social director can do it all day long, but it's iffy. The only heavy add-ons to her bike are the TCI skid plate and an O.E.M. rack, which in effect bring her up to maybe 120.
Clear as mud now?