First find out exactly how much the jetski & trailer weigh so you are not working on a false assumption. Also allow for any jerry cans of fuel, etc you will carry on the trailer. 900kg is definitely a braked trailer rating (no car will be rated >750kg unbraked), so check what the unbraked limit is unless your trailer has brakes.
Leaving aside the boat ramp traction issue, you should be ok provided it is comfortably within the limits, just leave plenty of room in front and also be very careful not to make the motor lug too much (use a lower gear), and take off nice and gently using as few revs as possible so you can slip the clutch out more quickly.
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