There are many different add ons for jeeps. A lot of these things do not serve a real purpose other than fun or to look cool. A jeep accessory I would love to buy is called the jammock. The jammock is kind of like a hammock. It is strung across the top of your jeep when it is topless and is attached to the roll cage. It is made of a strong rubber and basically it is just a fun thing to be able to sit in. You can use the jammock to relax while taking a break on the trail of even use it for camping.
Other things you can add to your jeep is a sound system. Most jeeps do not come with a very good speaker system so a lot of people add their own. I added a 10 inch sub woofer to my jeep because during the summer months I have the top off my jeep and the stock speaker system is very hard to hear with the wind blowing. With my added speaker system my music is a lot easier to hear while going down the road. A speaker system is by no means a necessity for your jeep and serves a very fun purpose.
Another product that isn't a necessity is called kik bax. Kik bax are used during the warm months when you have your top and doors off. Kik bax are a rear view mirror and foot peg combo that are mounted together and have slots on them That allow you to put them where your door is supposed to be. Most people roll with no rear view mirror during the warm months and that can potentially be dangerous so kik bax allow you to roll down the road with the doors off more safely. The foot pegs are also nice because it allows you to have your foot in a comfortable position while you go cruising.
There are almost other accessories people like putting on their jeep like are paracord oh shit handles. These are nice because they give you something to grab on to when going over rough terrain. Jeeps are by far the most customizable vehicles ever created and because of that I believe that they are the best vehicles in the world.