1.Before I buy this Suzuki Vitara 4x4 2.0 Litre V6 could

Possibly a bad connection on the Cam Sensor. Clean the two sides of the plug with electrical switch cleaner.

https://www.google.com/search?q=2009+suzuki+grand+vitara+2.0+rev+counter+jumping

Sorry for the delay in answering :>D

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if no reciepts timing chain replaced
you will be up for a few hundred dollars

make sure every electrical device works

have it checked over by independent mechanic

if a dual clutch if fitted these have a high failure rate

2/3 of the towing vehicle weight is the official limit ,but this will pull at least a big boat of a couple of tons ,V6 petrol engine has a lot of torque

I'd be first confirming whether you have a 1.6 litre Grand Vitara (petrol), or a 2 litre turbo diesel. The 2 litre petrol (straight 4 or V6) or 2.5 litre petrol engines are all chain drive.
If your engine is petrol then no lock tool is required (to hold the camshaft). Of course, there is a specific position that an engine should be rotated too before removing the belt from ANY engine.
If it's diesel, then although I'm unfamilar with that particular engine, the general requirement for diesel engines with high pressure injection pumps is "yes, you require a lock tool" to hold the injection pump pulley. As I think these are a common rail set-up, this requirement may not be necessary. Check with your Suzuki Dealer, or maybe someone else here will know more. A similar question may have already been asked and answered here too.

Haynes don't cover that engine. I've found a copy of the H25 engine manual which is similar to the H20 engine we have. If you search for SQ416 in google you'll find a copy you can buy or if you're lucky you'll find a free download somewhere like I did!! :-) It has helped me loads.

This is a very good car to maintain. Maintenance does not cost much. Fuel economy is superb (10 liters = 120kms.

Feel free and safe to buy it.

disconnect carter-gases pipe(over the ref-pos sensor), and if smoke stops, You don't need new engine :)

Take the vehicle for a scan there must be an error reporting issue that has caused the increase in fuel consumption.

Is normaly 450 kilos or 990 pounds
If the trailer have brakes is 680 Kilos or 1500 pounds if it is a 5 door vitara

I suggest either a "Haynes" or "Chilton" repair manual. They are both very informative concerning complete engine tear down.