Jeep Repair: Jeep Grand Cherokee Limited 2005, jeep grand cherokee, car clicks

Question
QUESTION: September 2007 I got into the Jeep and it would not start.  We were able to jump it and get it going, it would run until shut off, it would start right back up, but if I left it sit overnight it would not start the next day.  Was told that the battery needed to be replaced so we did.  Car started fine until February 2008, car is having the same problems.  We are able to jump it to get it started but once we leave it sit for awhile it will not start.  Turn the key and all the accessories come on fine, car clicks but will not start.  Took it to a dealership and they claim they can not get it started by evening jumping it and that I need to replace the starter so they can get it running to search for other problems.  I do not believe its the starter because I can get it to start if by jumping and on some occasions it will start on its own.  Very frustrated with the car and the dealership and just want a good answer as to what is causing the problem.  The battery and voltage were just tested and were fine.  However i have read about problems after having a hitch package installed, could this be the problem, could it be drawing the battery.  Any help would be appreciated.

ANSWER: get a good deep cell battery

---------- FOLLOW-UP ----------

QUESTION: Already replaced the battery with the most expensive battery we could find and explained that it was fine after being tested.  Is this or could this be a starter problem.

Answer
"We were able to jump it and get it going"
a starter if bad can have 5 cars hooked up to it and it wont move  U already solved the issue  when u jumped it off from a car.
The jeep u have must be a limited because it has alot of electrical stuff in it and eats batteries. What kinda battery did u put in it?