Sorry for the short answer above but was in a hurry.
Wrangler come in three model designations: YJ - late 80s to 95; TJ - 97 to 06; JK - 07 to present.
CJ (which wasn't called a Wrangler) was prior to the YJ. All models had only 2 door until the JK, which can be had with 2 or 4 door. The 4 door version is called the Unlimited, hence JKU.
The JK also have more creature comforts. All have off road capabilities beyond most vehicles but for really hore core stuff, a Rubicon package and/or mods are desired.
Since JK models are current, go rent 1 for a week end.
denton county, tx