US 25 also had the option of a storage tank head... fully enclosed.
US Yacht 25 b photo - Jeff Gegner photos at pbase.com
Capri 26 does as well, but it's large for a trailerable.
denverd0n Is 100% correct, larger boats are a bear to rig/derig quickly. However, I find it's not really the length of the boat, as much as it is the depth of the keel! Once in the water, rigging a 25 footer, or a 20 footer is really very similar, and the same amount of work if you can find an easy way to raise the mast... I have raised the mast and lowered it myself with a proper A-Frame configuration... NO I would NOT want to do it for a day sail, but a long weekend? Sure! The real bear is getting the boat launched with a 4 foot keel. I am working on making that easier using a strap launch method, that seems to work well for others.
But hey, if an enclosed head gets you where you want, go for it.