If the deck on the tracker indeed comes up easily like crumpdoc says then I would go with double seat bases, at least 31 inches apart. I have a sidekick for my small boat and the only issue is when slid all the way together at 30 inches (base to base) you have to face the stern, climb in the seat and swing to the outside over the sides of the gunwales to face forward. If you don't think mounting double seat bases will be easy enough, then look into a low profile double seat mount, that way you can still get into the seats with out climbing over the tubing frame and enter the seats from the middle. Again, this is my opinion based off my experience in a small aluminum boat with a narrow deck 52" wide, my deck is riveted down and mounting double seat bases would require using fast rivets to secure.

Also, keep in mind the further you move your seats back the further your rod holders will be in the boat, meaning if you fish 14 foot rods and 3 feet of rod is in the boat then you only have 11' of rod out away from the boat and TM.