If you want to go light weight and fast, find an RL 24. The boat weighs 1600 lbs. Weighed in on the trailer with all my junk at 2700 lbs. One thing about the RL is that with a swing keel, the boat sits very low on the trailer. This means less wind resistance. The weight is low, so it handles very well on the road. Ironically, except for on a steep hill, this boat tows much easier than my previous 17 foot American Fiberglass, which only weighed 900 lbs. The AF 17 had the weighted keel below the boat, which meant on the trailer, it stuck up in the wind, which made it pull very hard.
Besides, if you are towing with an Outback, shouldn't you be sailing Australia's favorite trailer sailor.