Blue Ice, IIRC weighs 2250kg all up on the trailer. The previous owner to me, John Lancaster weighed her on a weighbridge. The SBS trailer that she is on is a very heavy duty piece of kit and is really too big for the job. On long runs she tows much, much better with 60 galls of fuel in the tank than empty!
In fact I wouldn't tow her lightly laden as she was too bouncy for my Isuzu Trooper 4x4. (Which I did try to sell to Richard as a package deal btw
So you could definately get away with a lighter weight trailer. All up weight is still going to be in the region of 2000kg I'd say. I have launched her solo on a few occasions. It just requires a bit of time and forward planning. For manoeuvering around the drive John L had a petrol or electric driven trailer buddy thing that connected to the trailer and provided the power to manoeuvre the trailer around the drive. I believe this connected to a fitting near the jockey wheel.
IMHO the 7.5m Scorp is an excellent balance of trailability and an excellent seaworthy RIB. The high tubes/deep deck make it feel very secure for the family and of course the ride and handling is sublime. But then I am biased!