My understanding, please correct if wrong. This isn't completely correct as a lot of trucks have options that didn't come with a trim package (ex. base model with 4.0)
Custom/X/XLS: 1986 only. All longbeds, in order of fanciness. 2.5 or 2.8, both gutless, the 2.8 is bad in every way possible.
Base 86-92: Exactly what it says on the tin. No frills, some thrills. Usually 2WD with a stick. 2.5 is standard, 4.0 could be optioned in after 87.
SporTruck 87-92: One step up from base. Most had 2.5/stick and 2WD. Some ( :yes:) came with the 4.0. Changed to the squiggly lines in 1991, which is a pretty rare style. 87-90 is probably the second most common MJ model.
Eliminator 88-92: The 'street' package with most comfort options. Came with 2WD, 4WD could be optioned. Became the top trim level in 91, when Laredo was dropped. 91-92 Eliminators almost always have 4WD, I think.
Pioneer 88-92: Off-road package. Always 4WD if I remember correctly.
Chief 87-88: Not terribly sure about this. Pretty rare. Has a 'Comanche Chief' decal on the lower doors.
Laredo 87-90: I want to say this was the top trim level while it was available.
Sport '92: Introduced by Chrysler in 1992 to curb poor sales. Had a different vinyl, and usually had the 4.0 (I think.) Pretty rare.
Metric Ton: Not a trim package, but an option group. Bigger leaf springs and the highly desirable Dana 44 axle. I think only long-beds could get this option.
Don't hit me/shoot me/spit on me/kick me in the face if I'm wrong. Just off the top of my head. Hope I helped! :thumbsup: