Based on the Qts, Vas, and Fs specs for that speaker, your optimum ported box size would need to be over 9 cubic feet. Seems this speaker is meant for a sealed enclosure. The Comp RT speaker on the other hand needs a ported enclosure size of 4.883 cubic feet - a far more manageable size considering the space constraints in the 2DR.
I would suggest getting a tape measure to determine the actual space you have in your Jeep (w and d would be the same as others, but your max height will be determined by your own preference), then calculate the maximum cubic feet your enclosure can be.
From personal experience, a smaller sub in a properly sized/tuned ported box will generally outperform a larger speaker in an improperly sized/tuned box - all things being equal. depending on your max cubic feet, you may save some $$ by going with a 10". Not trying to change your selection, just offer alternatives in case you are not 100% on that size/model of sub.
has a number of great formulas to help you determine the optimum size and tuning based on your speakers individual characteristics.
Overall box size