The only way to get a lot of hours on the water is to have the boat at a club or at the local waterfront. Hours on the water is in my opinion the only way to become fast. So to train efficiently you need to have the boat ready to go, just hoist the mainsail and get on the water. It dont matter if the boat is 10 or 8 feet wide if it is at the club?

Is it just multis that are trailer sailed in Aus and US, or is this the way it is for most dinghys as well?

I just can not imagine trailer sailing any boat, would take so much more time. Now it looks like they are building a small boat harbour just 5 minutes (literally) from our house, and I have already flagged my interest of keeping a cat there. Looks like it will happen as well as it is one more member to pay dues and be part of the community works.