Wow...
Man, I have looked for one of those for about 7 years. I've talked to every hobby shop I know of, and I've spent hours on the internet and ebay searching for one. I had a 92 sport that I upgraded to be such a sweet truck. But, besides matchbox and hot wheels cars, the closest thing is the grand cherokee from Tamiya. I'm not sure quite how modifying that would yield a normal cheokee, given that, among other things, the whole body is the wrong size and shape for a normal cherokee...but I suppose if you can figure a way....
And hey, if you EVER find a model of a cherokee, big or small...let me know, I'll be the "second" to buy one!
good luck
jonathan