Best setup for lightweight cycle touring with Ti road bike
I would avoid a trailer.

On rear rack you are going to have heel clearance issues.

It may seem extreme but get a front fork with braze-ons.  Braze-on on the inside and outside for really solid rack mounting - check out the Salsa Vaya.  Not going to cost you more than a trailer and ride a lot nicer.    

Also consider frame bags. Check out http://www.revelatedesigns.com/. See this set up http://moots.com/our-bike/cross/routt-45/overview/. You can put water bottle cages on the axles.