Al1943's explanation of rake/trail is very good. Along with finding a fork with a suitable rake, you are going to have problems finding a new fork with a 1" steerer.

The closest I could find is a Surly Cross Check fork which has a rake of 44mm and a crown to axle length of 400 mm which is probably a bit longer than your Trek fork. It is available with a 1" threadless steerer and has canti bosses.

http://surlybikes.com/parts/cross-check_fork/

Otherwise a fully custom fork may be the only alternative.