Doors – How to choose a router for fitting doors

I'm not sure about ChrisF's suggestion since I've never had that particular problem (with the door rubbing on the hinge side) - is the issue that it's hitting the frame on the hinge side or the doorknob side?

If it's hitting the jamb on the doorknob side (as if the door is now too wide) then the usual solution is to trim down the door. Usually I would run it through a table saw, but you could do it with a circular saw as well if you are really careful.

Just make sure to trim off the knob side rather than the hinge side so you don't have to worry about mortising out new spots for the hinges (and then risk being off on the top of the door)

If the existing setup works, I don't see any reason why it wouldn't work with new doors instead. One down side to this setup though, is that doors without jambs aren't that secure and could probably be kicked in fairly easily. If it were my garage, and I didn't want a standard fold up door or a roll-up, I'd probably put in 2 larger barn style doors, or if you have the space, one of those sliding barn style doors that has an overhead track to slide on.