Trading Skyline wit anotha nice car or even yours

ok ok... i was reading in a Super Street magazine, and a person said that he traded his Mazda RX-7 for a 1995 Skyline GTR33, just to borrow, from moterex. So wut i wuz wonderin wuz that if, n e one of us could trade our really really really nice car for a Nissan Skyline, would it depend what car it is? Would Moterex even let us do this???