That is essentially what a G32 is... but wow, the design weight seems heavy! The G32 is less than that fully loaded and on the trailer. But, yes, other than the weight, that is what I'm looking at.
The other option is a Kelsall approach using KSS panels and building a POD cat with AMAs that slide from a 8'6" to about 12'. Derek has yet to build one of his KISSKATS but the idea of building a racer intrigued him.
I think a POD cat similar to the KD800 would fit what I'm thinking rather nicely. http://www.ikarus342000.com/KD800page.htm
But, if you are going to the trouble of adding the complexity of a variable beam in the form of a folding/sliding system are you better off with a catamaran or a trimaran in this size range? Which one of the two would give you a better performance/ease of use/interior space combination? That's a tough question.. It's like asking how long is a piece of string.
Traditionally, trimarans have dominated this market segment, and with good reason. In the 22' to 30' size range I believe a trimaran COULD give you more useful space given an equal level of performance when compared to a catamaran... but then again doesn't the 8.5 meter box rule class seem to prefer catamarans?
At the end of the day it really comes down to this: I'm looking for a clever design that can be truly trailer sailed... meaning the boat can be launched from a trailer and sailing by 1 person in minutes... I would like the boat to be "fast" and have enough accommodation for 2 for a weekend of spartan camping.
"Fast" and "accommodation" are the two nebulous criteria here, A quick setup and launch is the part of the design that can't be compromised.
I think the G32 fits, the L7 probably fits (I have never seen someone set up and launch one, so I don't know exactly what is involved) the KD 800 approach fits, heck even the DC3 and seaclipper 24 have a shot as long as the rig is engineered to raise and lower quickly and easily. Although, I believe I would be happier with the performance of the L7 vs. the seaclipper. Nevertheless, from a cost benefit perspective, the DC3 and seaclipper 24 are notable designs.
And a 26' to 28' Jarcat with water ballast would most likely fit the criteria, but at that point a low budget L7 type trimaran may start to make more sense from a performance/dollar spent perspective, especially of the Waller weighs 800 to 1000 lbs more than the L7 would. But, if the waller was built to be light, by default it would be a strong contender. My criteria may seem murky but they really aren't. The selection criteria do not contain a discrete answer. It is more like a series of differential equations that can be solved in terms of one another to yield a solution set instead of a single answer.
Cost and grief of ownership must be minimized. The G32 wins there... by light years. The L7 is most likely another very strong contender along with a light waller/jarcat.
Fast! The L7 and G32 win there too.
Accommodation.. waller/jarcat are strong, the L7 and g32 pass as well in my opinion.
Sticker price. Based on what I know all of the designs are within budget, although I don't have a feel for how much building a kelsall would cost.