Rough Riders, a brand of studded condom, is not to be confused with the New York rap syndicate Ruff Ryders, which features Jadakiss, DMX, and Swizz Beats, who would certainly not all fit in the back of a Nissan Pathfinder (that said, the latter interpretation amplifies a certain ambiguous attitude vis-à-vis group sex evinced by this song and others on Ready To Die)

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I think the lyrics is “epilogue by James Caan.” Caan played Sonny in The Godfather, and the The Godfather novel explains, explicitly, that Sonny had a penis that was so big his girlfriend had to get surgery to expand her vagina so he could fit.
Sorry young, not to hate but I’m pretty sure the original explanation is correct. He is referring to LL Cool J’s song back seat. LL Cool J even alludes to this shout out here: http://www.mtv.com/bands/n/notorious_big/lyrics/index11.jhtml