Unfortunately, to get enough usable room for six in a trailerable boat, you probably have to look back to the 1980's and early '90's. Why? Because every year the cruisers are made more stylish, 'swoopier' and that translates into less cabin space. Bayliner has traditionally done a great job of utilizing space, but you have to be careful- build quality is generally only fair. If you can find one, take a look at a 25' Larson Hampton. A friend has one. It's got a roomy cabin and long seats in the cockpit that'll easily sleep a couple of kids. The later Larson Cabrio models went the way of all the rest. It's hard to beat a Carver, almost any Carver, for roomy, well laid out cabins. It's Carver's forte.
Frankly, I wouldn't be looking at doing more than an overnight in anythng you can reasonably trailer. You just won't have anough room for everybody to be comfortable for more than a night.
My .02