Those are not questions that can be answered properly with so little information to go on. You haven't tols us anything about your Jeep or how you plan to use it. My guess is you also don't have enough information yourself to ask the right questions in order to get the answers you need. Spend some time here and get involved in some of the myriad of threads concerning the subject. Once you get a better understanding, you will be able to ask specific questions to which you can get specific answers.